i would check your memory ive seen that happen when dimms go bad.
What Power Supply Unit do you have in the computer?
Have you recently added any new hardware?
Have you opened up your computer (make sure it's turned off) to check that everything is firmly connected.
but do u think that this will work, because i have gotten 2 windows 7 cds and put boot prio first and one of them was ****** up but the other cd which i know for sure is fine, when the pc is botting the cd it turns black. wont it happen to this cd aswell??On the computer that you are on now, can you download and burn memtest86+ to a CD or DVD and then insert the disk into the non working PC and boot to the disk. You may need to change the BIOS order to enable your computer to boot to the disk first instead of the hard drive. If you do not have a CD to hand, there is a USB alternative also available on the page. If you use the USB method, change the boot order to USB as the first device. When the program begins, let it run for at least 7 passes.
If you don't know how to change the boot device, give me the make and model of your computer and I will walk you through it.
Boot off of the XP CD and get to the Recovery Console. Here type chkdsk /R and press enter. The Check Disk utility will try and fix any file errors.
yup its a desktop computer , wow man i dont know how to answer u i dont know the diference between a seperate video card or the onboard vga. i know that my computer doesnt have an AVI entrance its a vga connection between my screen and the pc. reset the video card could u please explain in terms for morons like myself ;(Is this a Desktop computer or laptop? If it is turning black in the boot process then there is a major problem with the video card. Are you using a separate Video card or the onboard VGA? If it's a desktop and you have a video card, Reseat the Video Card into the slot. If that fails, remove the card and use the onboard video.