Sorry I'm late getting this response in, but I recently ran into the same problem about which Reid started this thread. The response he got from user846 is only part of the solution. People who have this issue might also try resetting the CMOS first, then setting the CPU frequency jumper to 100MHz; that's how I got mine to display with an Athlon XP 2000+.
Now here's the biggest:
check or replace the battery!! My board had a 2032 that was dead from the reseller. Once replaced, everything functioned fine from that point on.
One other note - if you have any faulty components or peripherals connected, that could also do it. I tried to connect a CD burner that had been fried from a faulty power supply in a previous build (didn't know it until I went through this trial connection), and the system refused to display until I disconnected it from the ATA bus.
mycroft69
>> Stay informed about: MK40V/N will not boot