Re: Dell Optiplex GX280 no boot and fan going crazy

In my Dell Optiplex GX280 SFF was the same problem. I've found that PSU connector P2 was like "burned" inside (under +12VDC yellow wires). I think that high power of CPU eventually caused lost of contact in this segment. I made some adjustments to connector and now Dell boots succesfully.
Maybe it will help..