before thinking about replacing the video cardTest all power and data leads that attach to your hard drive IDE,SATA
the leads from your (motherboard to your hard drive) make sure they have secure dust free connections and are not faulty or just replace them they might be faulty
if its a 40 pin flat ribbon type it will be the first to fail
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty
even something as small as a faulty electrical fan and its lead can cause you problems
computers need all power and data to continue through every working device and to have an end so any faulty leads will end up with a computer error
make sure your graphics card is securely seated with no dust built up or in the socket
if you remove your graphics check the socket to make sure its dust free
restart your computer then reinstall it this should activate found new hardware wizardif you need to replace the video card it will be attached to the rear of the vga lead inside your computer usually in a pga slot
Remove your computer's cables.
Turn your computer around so the back faces you.
Remove the two screws on the computer holding the right side of your computer to the case. On many models of gateway computers, you only need to remove the screws with your hand. Remove the right side of the case to expose the interior. Unscrew the metal plate of your old graphics card holding it to your computer's case. Remove the card by sliding it out of the motherboard.
Slide your new graphics card into the slot from where you removed the old one. Screw the metal plate to your computer's case.
Reassemble your computer and connect its cables
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