Installed ATI Radeon 5750 into HP m8020n = No Video Signal

[kprime]

Hello,

My wife bought me a ATI Radeon 5750 and a new 500W power supply for my HP m8020n. I installed both but when I start the pc I get no video signal from either the DVI or VGA. When I put back original card works no problem.

So is this card compatible with my PC?

 

[Lmeow]

Try removing your older card's drivers completely, then see if it will work. Is the fan spinning (on the HD 5750) when you power it up?