So, one mosfet is shorted. I'm no electronics wiz so I have to ask basic questions. It's an irf510, right? Fry's electronics shows no item of that name. Is there another company that makes something generically the same, or is there a similar item available at Fry's that I can replace it with?
Is that the real issue? With the zero ohms from source to drain on one transistor and with the unit powering up when brown wire disconnected is shorted mosfet the answer to this problem (at least short-term, anyway)?