Debugging the Block Erupter Cube (solved, replace the fan!)

[boezombie]

Okay..Here we go..

My 2 cubes are running off at CX500 power supply. I had one running just fine. I bought a second one and plugged it in but it didn't work so I unplugged it and plugged my other one in and it also stopped working. The fans have been replaced but the only thing that comes on is th SB power light. When I plug in an ethernet cord nothing happens. Unable to connect to both cubes. Tried the factory reset but im pretty sure nothing is happening. Fuses are good. Fans spin up fine. Blades are all set in place and I dont see anything loose as far as head sinks go.

I'm very confused. x-x Halp meeeeeee.