I recently donated a Presario 5451 to my best friend's kid. It is bone stock specs (Win98SE, 450 MHz AMD K6.) I am trying to add an ATI Radeon 7000 64 MB PCI video card.

With the card installed into any PCI slots the PC will not even boot, regardless of which video port I have the monitor plugged into.

If I remove the card, it boots fine.

The MB is a Gigabyte GA-5SMM. I have searched and researched and tried recommendations from both Compaq(HP) and Gigabyte's websites to no avail.

I cannot find a jumper setting that would disable onboard video.

I have also looked in CMOS for anything related to video. I may be overlooking something in here, but I am not sure.

I also noticed that the PC will not turn off by pressing and holding the power button with the ATI video card installed.

It will turn off without the card installed by pressing and holding the power button.

Thanks in advance for any suggestions. A 5 year old wants to play his Dora the Explorer really, really badly.