Today I was disassembling a newly acquired SE/30 to dust the insides and whatnot. The only thing I actually took out of the unit itself was the motherboard. After reassembly, the fans came on momentarily, but the screen stayed black. After further attempts, the SE/30 does nothing when the switch is flipped. xx(

What could I have done to prevent it from powering up? I didn't fry my power supply, did I?