I don't have time to read what everyones posting on here but I did the same thing thought my board was dead TODAY ....
Cleared the CMOS about 5 times.... and yes I fully Cleared it power chord out, battery out , jumper off 1&2, jumper on 2&3, waited, jumper off 2&3, Jumper back on 1&2, battery back in, then power back in... NOTHING for 5 times or more....
Well I take out RAM, Video Card, And PS Connector... then tryed to reset cmos and BAM its back on!!!!
So I see if bios change lets me OC any more then normal .... NOPE .. video went out cause I went to fat with the FSB... So I go to reset CMOS again ... same thing happens so yep I just decide Ill do the same thing I did to get it workin last time and YES im back on it as we speak!
So yes something is screwie but atleast its working..