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Graphics card not detected

Last response: in Graphics & Displays
September 5, 2013 1:34:10 AM

i have a nvidia GT240 which i know works because i used it in a different pc. when i switch on the computer the fan on the card start working and i see the desktop ( in bad resolution though ). i thought the problem might be outdated drivers , but the card does not appear in device manager. the only thing in device manager under display adapters is : "Standart VGA Graphics Adapter " (which is the onboard graphics chip i think ). I thought that the motherboard might be broken and therefore not detect the card so i switched the card with another i had lying around and it worked no problem and got shown in the device manager. I cannot figure out what the problem could be , please help

More about : graphics card detected

a c 191 U Graphics card
September 5, 2013 1:35:54 AM

Restart the computer and see what happens.
September 5, 2013 1:46:38 AM

i did restart it multiple times. no change :/ 
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September 5, 2013 1:55:07 AM

Also i know that its not a PSU problem because i ran the exact same setup before and everything worked fine
September 5, 2013 2:16:21 AM

i just though of something, the last time i saw the card working was before i reinstalled windows 7, not sure if that helps solve the problem
a c 191 U Graphics card
September 5, 2013 9:31:22 AM

Reinstalling Windows 7 is your choice. Its alot to lose. Try everything else first.