I just finished building my computer from a bare-bones kit I bought online. When I go to turn it on, it starts for a second and shuts off. The fan turns on for a second, on the CPU and in the power supply. The lights on the case also come on. I unplugged the hard drives, maybe thinking it would help, but the problem is the same.
The motherboard is a Gigabyte M68MT-S2P. I bought it all in a kit, so I'm assume it all is compatible.