I have an HP Pavilion 7955 (1.6GHz, 256MB RAM, 40GB HD) whose graphics card (TNT2) I'm trying to upgrade to a Geforce4 MX440 8x.
Everything works fine when the TNT2 is in the AGP slot. When I replace it with the Geforce4, the computer gives me beeping noises on startup and gives me a blank screen. It won't even display the BIOS's POST, and the monitor's LED flashes as if it isn't even receiving a signal. When I put the TNT2 back in, all is well.
I know it's not the Geforce4, as it works fine on another machine.
The motherboard doesn't have on-board video, so there's no way for me to troubleshoot this. Does anyone know what's going on? Help!