I have a Nf4 Ultra Infinity mobo that I sent back to the manufacture for an rma. They sent it back to me 2 weeks later. The first time i sent it to them was because when i started the computer, the loading screen would get stuck on the Infinity logo. I took the computer to a computer store, they told me the video card AND my motherboard was broken. I went to buy a new video card and sent the mobo in. Now Im having this problem. I cant seem to start my computer up. On the monitor, it saids "no signal". Plus there is no *beep* when i power the computer on. I upgraded from a geforce 6600 to a 7900 now. I also bought a new psu , (500w). I have a AMD 64 3000 venice cpu. WHat could be the problem. Today , DFI rep called me and tried to help me out but nothing worked and he suggested my cpu is broken? *PS- I disconnected and replugged EVERY wire and pin together from each component at least twice, so dont say "check the wiring or connections".