8600gt not working

[dmudgal]

hello guys,
my xfx 8600gt crad is showing as "Standard VGA graphics adapter" in Device Manager. i mean i can not install it's drivers bcoz it says no such hardware found.i can not run Aero also. Even in xp it's not working now.

the problem came after i installed my new WD 320 gb Hdd. but it's working absolutely fine.
the monitor is attached to the card.
pls help...

thanks in advance

My system Specs are : asus m2n-vm dh mobo......amd 4200+......4x1gb 667 kingston ram.

 

[CCT]

Check that you didn't dislodge any of the power connectors to the card.

Unplug the power to the new HD also as a test (if you think the psu is maybe not powerful enough).