Motherboard dead? CPU fan starts, green light on board, every other fan works...

It's an Asus K8N-E socket 754 MB.  I just got this from a friend who thinks he fried it.  I guess while he was playing CounterStrike, his usb mouse cord got hung up on something and he was killed in the process.  In his fury, he started pulling hard at the cable and actually ripped the usb connector off and broke the cable.  He said after that, all he got was a black screen.  I have his video card, ram, PS and MB.  I originally tried swapping his video card into one of my other machines, and it didn't work at all.  However today, now that video card works.  I have tried putting a known working card into the "fried" board, with a known good stick of ram and a good PS.  When  you hit the "on" switch, the cpu fan starts going, as well as the video card fan.  Although no input is getting to the monitor.  I tried changing some USB power jumpers around hoping it was maybe a crossed wire with the USB connector itself, but it didn't work.  I also plugged a good speaker into the speaker connector, and it doesn't beep at all.  The green light is on on the MB, and I've tried clearing the CMOS.  Any ideas?