I assembled them following all the directions, seating the heat sink securely on the CPU, and protecting against static electricity.
When I turned on the power, the power supply and CPU fans turned on, but the harddrive did not boot or turn on. When I disconnected the IDE cable from the harddrive to the mobo but left the power cable to the harddrive on, the harddrive did turn on. Under none of these circumstances did the BIOS show up.
Hitting the power button to turn off the power did not work (it just worked to turn the power on).
In troubleshooting, I triple-checked the headers to be sure they were correct, tried another harddrive that I know for certain works, and cleared the CMOS. None of these actions changed anything.
Does it sound like my mobo is bad?
Edit: I found the problem: On this mobo, there is both an ATX1: ATX 20-pin power connector and an ATX12V: ATX 12V power connector. BOTH must be connected. I didn't have the ATX12V connected.
<P ID="edit"><FONT SIZE=-1><EM>Edited by andu on 07/04/05 12:42 PM.</EM></FONT></P>