Here is my computer: Therm PSU 550W ASUS P5K-vm mobo Intel Dual Core 2.2 g cpu 2 gigs ram XFX 8600 GT video card Linksys wireless card Had this system for over a year and half, then all the sudden no output through monitor. Powered everything down, opened case, the powered back up. All fans, lights and everything else is working. Still no output. Switched monitor to onboard vga and presto, screen appeared. So I switched video cards, tried again, same problem. Was adviced PCI-E slot could be bad. Tried a different mobo with both old and new video cards, same problem. Tried different ram in both mobo, same thing. Checked PSU, good to go there. The only thing I haven't swapped is the CPU, can this be the problem? Also Used two different PSUs.