I have been, without success, attempting to repair a friend's PC for the last week or so. When the system is powered on the HDD and fans all sound as though they are running properly, however there is never a POST beep nor is there any video display of any kind. Here are the approximate specs:

Pentium 4 HT (speed not known)
BFG nVidia GeForce 7800 GTX OC PCI-E
2GB DDR 3200
HDD appears to be a Seagate SATA drive

So far I have discovered that the video card is still functioning correctly as it performed fine when placed in my machine. I have switched the PSU with a known-good one of similar power with no change in results. I have switched RAM with known-good of the same speed with no results. Upon removing the GFX card I receive the correct POST beep code to indicate the lack of a VGA card. I'm running out of ideas, if anyone has any suggestions on where to go next, I would greatly appreciate it. Also, I do not have a known-good PCI-E graphics card to ensure that the PCI-E slot is still functioning properly, as the card I use in my own machine is a 7950GX2 and it does not fit properly in his case.

Thanks!

Hello and welcome to PC Help Forum.

What is make of mainboard?

Is there onboard graphics?

There is no on-board VGA of any kind. The Motherboard appears to be a BioStar socket 775 nForce4 board of some kind. I can't figure out the exact specifications. It has 2x PCI-E x16 slots and 3 standard PCI, onboard gigalan, and 4x DIMM slots.

If you look on the mainboard it should tell you a code or make n model of mainboard.

EXAMPLE:AnandTech: NVIDIA nForce4 Ultra: Biostar's Performance Surprise

Have you actualy opened her up and checked fans etc are running?