I got a PC from my old boss before he moved. Nothing fancy, just his old gaming rig. I'm having problems getting it to work. It gets power but I get no display. It doesn't have an onboard video so I used a 7900 and some PCI-E 4x display card but still no soup. I also tried it with the 8800 GTS I sold and that didn't work either. I've reset the CMOS, taken out one of the sticks of RAM and changed video cards.
What should I do next?