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In other words, Windows never shows up. You may have a monitor problem. Try using another known-good monitor on the computer and see if anything shows up on the screen. If the second monitor works, the first one is bad. Monitors are not worth repairing. Just buy a new one. Never open the back of a monitor to fix it. The capacitors inside monitors store electricity. You could be injured or even killed. If the screen is dark, it could be a video card problem. First, find the video card. This is a circuit board that fits into a slot in the motherboard. The cable from the monitor connects to the VGA (video graphics adapter) port, which sticks out through the back of the computer. If the VGA port is part of the motherboard, the video is built-in. You can't fix that. Otherwise, it will be part of the video card.Assuming you have a separate card, be sure it is firmly seated. The front end of the card can rise out of the slot inadvertently when the back end is screwed down to the computer frame. If you have a computer that is working perfectly, turn it off and remove the video card. Put the card that works in the problem computer. If the system works, you need a new card. If you don't have an extra card to test your system, buy a cheap one. If it doesn't solve the problem, take it back. You can spend hundreds of dollars on a video card. But if you're running business applications and surfing the Web, buy on price.

 

3. If you regularly get the "Blue Screen of Death," you may have a random access memory (RAM) problem.

 

Note the message on the blue screen, especially the numbers. Check it in Microsoft's Help and Support Knowledge Base. Also, put the text of the error message in a search engine and check the Internet. Assuming you can diagnose it, a memory problem is easy to fix. If you can't find the diagnosis information you need online, you can try swapping out memory sticks from another computer. But that memory must be the same type. If all else fails, take the old memory to a computer store. The people there may be willing to test it. Sticks of memory go in slots near the microprocessor. They're about four inches long. Remove the old memory and match it at the store. Memory prices are all over the map, depending on type and speed. Be sure you get the same type. When you press the new memory into the slot, you will probably have to use some force. The clips on each end will snap into place when the memory is seated properly.

 

 

If you have another computer, swap hard drives to diagnose the problem. If your computer boots with the other drive, yours is probably bad.  Sometimes, a reboot will work. Your drive might have enough life to spin up occasionally. If this works, transfer your data to another drive, pronto. According to techie lore, you can seal a nonworking drive in a bag and put it in a freezer overnight. That could shrink things enough to free them up. I've used this trick a few times and it's worth a try. A regular backup regimen will save you in case of hard-drive failure, assuming you aren't backing up to the same hard drive. If the drive is dead and you don't have a backup, a computer shop may be able to save your data. Hard drives are cheap. Get one boxed for retail, which will include instructions and any hardware needed.Your hard drive is in the front of your machine. It will be about the size of a paperback book and is probably held in by four screws, two on each side. Power and ribbon cables connect to the back. Put the new drive in and install it as the master. Reconfigure the old drive as the slave. The instructions that come with the new drive should explain that. Boot the computer and install Windows on the new drive. If you're lucky, the computer will see the old drive (it will be D:). You can then transfer your data to the new drive.Replacing a hard drive is more difficult than the other operations. However, if you pay to have the work done, it may not be cost effective. You might be better off buying a new machine. So if you are adventuresome, and you have the time, changing the hard drive may be worthwhile.

 

 

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