Tips...!

1.How to buy a Computer?

  a. About Computer:

A desktop personal computer is a most popular mode of personal computer.  The system unit of the desktop personal computer can lie flat on the desk  or table. In desktop personal computer, is usually placed on the system unit.

A Purchasing a home or business computer can be a big and sometimes costly  decision. Below is a listing of helpful suggestions for what to look for and ask  when purchasing a home or business computer new or used.

NEW vs. USED

Today there are two options to buy a computer, a new or used computer. Used computer are some time out of date, but you can buy it with very low  price as compare to newcomputer, but I think branded or used computer  are much stable than a new computer.

Before purchasing a computer consider if you should purchase a new or  used computer. Many individuals sell computer before they are out of date  allow you to purchase a relatively decent computer.

Before purchasing a new computer from a computer manufacture look at  what is available and review the below precautions when purchasing a computer.

More Considerations

When purchasing a computer it is likely that you will have a general idea of what  you may like in the computer or how you would like to configure the computer.

Below is a listing of the various components likely to be found in a computer  and recommendations and tips when considering any of the following components.

Device                   Short recommendation         Case Generally there are two types of Computer Case are available in market, for Example  Tower case and desktop case. The system unit of the desktop personal computer can lie flat on the desk or table and the monitor is usually placed on the system unit. An other model of the computer case is known tower. The system unit of the tower PC is vertically placed on the desk or table. But purchasing a computer case is generally not an important consideration when you are going to buy a Computer.  However it depends upon the user needs and choice to building a computer case may find it important to consider the following considerations.    CD Media CD-R -always will be an important consideration to think about when purchasing a new computer or used computer. A CD-writer or recorder (or simply CD-R drive) is used to write data on CD-R disks. Usually, a CD-writer can read information from CD as well as write information on CD, The locally produced CD-R disks are created with CD writer. The speed of these drives is up to 52X or more. CD-RW - You must have a CD-RW drive to write date on the CD-RW. These drives have read and write speed is up to 52X or more but the re-write speed is 10X or more. The CD-RW drive is advanced and more expensive than CD-R drive. It can write data on both CD-R and CD-RW discs and also read data from them DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB.     Hard Drive Hard drives have and always will be an important consideration to think about when purchasing a new computer or used computer. Hard disk is most commonly used storage device in personal computers and laptop computers. Most application programs and operation systems require hard disk for installation and operation.      Processor The computer processor is and will always be an important consideration when purchasing a computer. Processor is considered the brain of the computer. The CPU fetches instructions of program from main memory and executes them one by one. The speed of the CPU is measured in Mega Hertz or Giga Hertz and speed from 500 MHz to 3.4 GHz, it depends upon a user needs, that is why purchasing a processor is an important consideration when building or buying a computer. There are several considerations and additional information about what to ask and look for when purchasing a processor directly or already installed into a computer.

b. Buying a Server Machine: Server is the most powerful and fastest, and also very expensive machine. It is used to process large amount of data and to solve the complicated scientific problems.  The severs computers are used in large organization such as Banks, Airlines andUniversities, that it is a big decision for organization to buy a proper server machine according to their need  Below is information and help for what to look out for when purchasing a computer server.       More Considerations When purchasing a Server computer it is likely that you will have a general idea of what you may like in the computer or how you would like to configure the computer. Below is a listing of the various components likely to be found in a computer and recommendations and tips when considering any of the following components. Device Short recommendation Case Generally there are two types of Computer Case CD Media CD-R -always will be an important consideration to think about when purchasing a new computer or used computer. A CD-writer or recorder (or simply CD-R drive) is used to write data on CD-R disks. Usually, a CD-writer can read information from CD as well as write information on CD, The locally produced CD-R disks are created with CD writer. The speed of these drives is up to 52X or more. CD-RW - You must have a CD-RW drive to write data on the CD-RW. These drives have read and write speed is up to 52X or more but the re-write speed is 10X or more. The CD-RW drive is advanced and more expensive than CD-R drive. It can write data on both CD-R and CD-RW discs and also read data from them DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB. Hard Drive Hard drives have and always will be an important consideration to think about when purchasing a new computer or used computer. Hard disk is most commonly used storage device in personal computers and laptop computers. Most application programs and operation systems require hard disk for installation and operation. Processor The computer processor is and will always be an important consideration when purchasing a computer. Processor is considered the brain of the computer. The CPU fetches instructions of program from main memory and executes them one by one. The speed of the CPU is measured in Mega Hertz or Giga Hertz and speed from 500 MHz to 3.4 GHz, it depends upon a user needs, that is why purchasing a processor is an important consideration when building or buying a computer. There are several considerations and additional information about what to ask and look for when purchasing a processor directly or already installed into a computer. c. Buying A New Computer Chassis: Generally there are two types of Computer Case are available in market, for Example Tower case and desktop case.The system unit of the desktop personal  computer can lie flat on the desk or table and the monitor is usually placed on the  system unit. An other model of the computer case is known tower. The system unit of the tower PC is vertically placed on the desk or table.  But purchasing a computer case is generally not an important consideration when you  are going to buy aComputer. However it depends upon the user needs and choice to  building a computer case may find it important to consider the following considerations.      CONSIDERATIONS • Color of Case • Type of Case (Tower case and Desktop case) • Size of Case The main and important factor is Upgrade availability in case. • Please must consider that case have enough slots which will allow you to add  additionalhard disk CD-ROM, Floppy drives or other drives.  • Other main consideration is that case have the availability for slots for additional  cards to be placed in. For Example VGA Card, LAN card and internet Modem d. Buying A CD-ROM Drives: CD-ROM drive is used with computer to read the information from the CD-ROM.  Today CD-ROM drives have transfer rates ranging from 48X to 75X or more.  Generally Purchasing aCD-ROM drive relatively easy task however can involve some  considerations when purchasing.      Technology of CD-ROM Before considering purchasing a CD-ROM it is also good consider the other available  options. CD-R - A CD-writer or recorder (or simply CD-R drive) is used to write data  on CD-R disks. Usually, a CD-writer can read information from CD as well as write  information on CD, The locally produced CD-R disks are created with CD writer.  The speed of these drives is up to52X or more. CD-RW - You must have a CD-RW drive to write data on the CD-RW. These  drives have read and write speed is up to 52X or more but the re-write speed is 10X  or more. The CD-RW drive is advanced and more expensive than CD-R drive. It can  write data on both CD-Rand CD-RW discs and also read data from them DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an extremely  high capacity optical disc with storage capacity from 4.7 GB to 17 GB.       TRANSFER RATES Today CD-ROM drives have transfer rates or speeds ranging from 52X to 72X  or more. For Example, a 52X CD-ROM drive has a data transfer rate of 7,200 KBps  (i.e. 48 X 150 = 7200)or 7.2 MBps. It means that the higher the number, the faster the CD-ROM drive. This speed is  generally only going to be noticeable when installing a program or copying large  amounts of data from a CD.       PRICE RANGE For a CD-ROM drive, not to be confused with a CD-R, CD-RW or DVD drive can  vary depending upon the speed and the interface the CD-ROM drive uses. d. Buying A CPU / Processor: Processor is considered the brain of the computer. The CPU fetches  instructions of program from main memory and executes them one by one. The speed of the CPU is measured in Mega Hertz or Giga Hertz and speed from  500 MHz to 3.4 GHz, it depends upon a user needs, that is why purchasing a  processor is an important consideration when building or buying a computer. There are several considerations and additional information about what to ask  and look for when purchasing a processor directly or already installed into a computer. TYPE The type of the processor can be very important consideration for users  who are building a computer. The main thing in processor is the  compatibility with the motherboard, Because the processor chip is  plugged into the motherboard. Today there are many processor manufacturers AMD, Motorola and Intel.  Final decision to buy a processor depends upon user need for example a home  or basic user can buyIntel Celeron or AMD processor. If you can afford then must go for latest processor if you want your  computer to retain functionality for four to six years. When considering any  of the above companies product ensure that a motherboard that is  compatible with that product is also purchased. For example if an Intel motherboard is purchased or currently installed into the  computer you will want to consider an Intel Processor. e. Buying A DVD Drives: DVD drives is used with computer to read the information from the DVD-ROM.  Today DVD drives have transfer rates ranging of different capacity. Buying a DVD drive is confusing task, because there are many option for this  purpose are available in market. Below we have listed important considerations  to look at when considering purchasing a DVD drive. Technology of DVD Drives Before considering purchasing a DVD drives, it is also good consider the  other available options. CD-R - A CD-writer or recorder (or simply CD-R drive) is used to write data on  CD-R disks. Usually, a CD-writer can read information from CD as well as write  information on CD, The locally produced CD-R disks are created with CD writer.  The speed of these drives is up to 52X or more. CD-RW - You must have a CD-RW drive to write date on the CD-RW. These  drives have read and write speed is up to 52X or more but the re-write  speed is 10X or more. The CD-RW drive is advanced and more expensive than  CD-R drive. It can write data on both CD-R and CD-RW discs and also read  data from them DVD - DVD stands for Digital Video Disk Versatile Disc. DVD-ROM is an  extremely high capacity optical disc with storage capacity from 4.7 GB to 17 GB. TRANSFER RATES DVD-ROM is an extremely high capacity optical disc with storage capacity  from 4.7 GB to 17 GB. DVD disc is specially use to store movie films. It is  also used to store huge database, music, complex software etc. OTHER CONSIDERATIONS DVD drives include: DVD option: DVD-R, DVD-R DL, DVD+R, DVD+R DL,DVD-RW, DVD+RW,  DVD+RW DL, DVD-RAM. Warranty: How long is the warranty and what does it cover. Support : Is the technical support number a free number is it open 24 hours  7 days a week. f. Buying A Hard Drive: Today hard disk is most commonly used storage device in personal  computers and laptop computers. Mostly application program and  operation systems require hard disk for installation and operation. That is way it is very important to verify When purchasing a hard disk  drive, this hard disk drive is suitable for your uses and has or does not  have the options you may or may not need. Interface of the hard disk There are many types (interface) of hard disks available in  the market for exampleIDE/ATA,SCSI,External hard drive. That is why first decide your need is internal or external hard drives.  When looking to purchase a hard disk drive the first it is important  consideration is the Interface the hard disk drive uses to  communicate with the computer . • IDE/ATA This type of hard disk is used with IBM compatible  computers, and very easy to install in a computer. Each IBM  computer has the availability for a maximum of four IDEdevices,  for example IDE hard disk , CD drive and DVD drive. • SCSI The SCSI interface is generally a better and faster solution  when compared to IDE/ATA but this solution is not best for common  user only best for server level machine. however in some cases can be  more difficult to install. To install a SCSI hard disk drive you must have a SCSI card  and an available connection on the SCSI cable connecting to the SCSI card. • External Hard disk There are many solutions are also available;  these include, USB Hard disk drive, Fire wire Hard disk drive and  Parallel Hard disk drive. The main benefit with external hard disk,  you can move it where you want very easily. Mostly external hard disk is  used for data backup and change the physical location of data. Other considerations Here are some important considerations to look at when purchasing a  computer new hard disk drive: Speed: Hard disk speed is playing an important role when your consider  a computer speed. The accessing speed of hard disk is also very high as  compare to other storage devices. It is from 5 to 15 MBps. The platters  of hard disk rotate from 3000 to 10,000 revolution per min. Warranty: How long is the warranty and what does it cover. Support : Is the technical support number a free number is it open 24 hours  7 days a week. g. Buying A Computer Memory: The Computer memory plays very important role in data processing.  Computer memory means the computer can use powerful program with  large size. It also improves the data procession speed of computer, that  is way it is very important to verify When purchasing a computer  memory, this memory is suitable for your computer and needs. Below is a listing of different considerations and tips to look for when  purchasing computer memory. Type Of Memory There are many types of memory available in market, Before purchasing  any memory or considering purchasing memory it is important that you  distinguish the type of memory that is required. Below is a listing of  some of the configurations of computer memory. Memory type: SIMM, DIMM, RIMM, Amount of Pins: 72-Pin, 30-Pin, etc.. Speed of memory: 10ns, 60ns, 70ns, etc.. h. Buying Computer Monitors: The monitor is a popular and most commonly used output device.  Most monitors used in personal computers display text, graphics,  and video information. Due to different and futures of monitor  purchasing can be one of the most important pieces of the computer  as it is what will display everything coming from your computer. Technology of monitor These are two basic types of monitors that are used with personal computer. • CRT monitors • Flat-Panel Monitors when purchasing a computer monitor it is important to know if you want  a CRT monitor or a Flat Panel monitor. CRT Monitors. A CRT monitor is similar to standard television. Like  televisions, CRT monitor size is measured diagonally, in inches, across  the front of the screen. Today, CRT monitors are available in various  sizes, i.e., 15, 17, 19, 21, and 22 inches. The large size monitors are more expensive and allow you to view more  information on the screen at once. Flat Panel / LCD. A flat panel monitor is also called LCD monitor.  A flat panel monitor takes up less desk space and also consumes less power.  Flat panel monitors are available with different sizes such as  15, 17, 18, 20, 21, and 23 inches. Flat panel monitors are commonly used in mobile devices such as  laptop and table PCs. Similarly, smart phones, PDAs calculators have  LCD screens. There are two main categories of LCDs. These are • Active Matrix LCD • Passive Matrix LCD Resolution The quality of monitor screen depends on its resolution, which is  generally proportional to the size of screen. 15" monitor typically has a resolution of 800 x 600 / 1,024 x 768 17" monitor typically has a resolution of 1,280 x 1,024  19" monitor typically has a resolution of 1,280 x 1024 21" monitor typically has a resolution of 1,600 x 1,200. Once you have reviewed the appropriate information and believe that  you are ready to make a purchase of a new monitor ensure that the  source which you plan on purchasing the monitor from is a reputable  source and you have reviewed our section on what to look out  for when purchasing over the Internet. i. Buying Computer Motherboard: The motherboard is the main circuit board of the system unit.  You can say thatmotherboard is the master circuit board in  the computer. Many new user of computer are not well aware  about motherboard that is why for users planning on building a  computer amotherboard can be a confusing decision. Below we have listed some considerations and tips when looking at  purchasing a computermotherboard. There are many factor of the motherboard is a crucial consideration  when looking at amotherboard. PC motherboard has two or more expansion slots used to add  new components to the computer. The memory chips are also inserted  into the expansion slot to expand the size of memory. Given option are  very important in any motherboard for example: Accelerator: It is used to increase the speed of processor. I/O: It is used to connect input/output devices such as printer, mouse  and keyboard. Game: It is used to connect joystick. Disk Controller: It is used to connect disk and CD drives. Modem: It is used to connect other computers through telephone line or  cable telephone line. TV Tuner: It is used for viewing television channels on the computer  monitor. j. Buying a Printer: These are most commonly used output devices used to get  prints of documents on the pager. Different printers have  different mechanisms. Therefore purchasing a printer can be a  sometimes confusing task. The following is additional information  that will help in your purchasing decisions. Technology of printers There are many types and technology of printer are available in  market but the most popular and commonly used are inkjet  and laser printer. Ink Jet Printer. The inkjet printer is not-impact character printer  and prints one character at a time. The printing quality of inkjet  printer is measured by the number of tiny ink of drops per inch(dpi).  Most inkjet printers range from 300 to 2400 dpi. Printers with  higher dpi usually are more expensive but having high printing quality. The speed of an inkjet printer is measured by the number of pages  per minute (ppm) it can print. Its printing speed is up to 15 ppm.  Therefore purchasing a printer can be depends upon printers dpi  and ppm but It depends upon user need. Laser Printer. A Laser printer is the fastest and high quality printer,  but a laser printersare more expensive than inkjet printers and their  print quality is also higher. The print quality and printing speed of  laser printers make them ideal for offices and business. The laser printer can print text and graphics in very high quality  resolution. The commonly user laser printers have resolution of 300 or  600 dpi and printing speed is from 5 to 30 ppm. The high quality  laser printers have resolution from 600 to 2400 dpi. The printing  speed of these printers is also more than 150 ppm. Speed and price range The price of laser printers depend on the quality and printing speed.  The color printers are more costly than black-and-white laser printers. The higher the resolution and speed, the more expensive the printer. The price range can vary depending upon the quality of the printer  and the type of printer for example inkjet, laser printers. READY TO BUY Once you have reviewed the appropriate information and believe that  you are ready to make a purchase of a printer ensure that the source  which you plan on purchasing the printer from is a reputable source and  you have reviewed our section on what to look out for when purchasing  over the Internet.