Oct 09 2011, 11:27 AM
The symptoms suggest a failed power supply -- it sounds like one of the rails has failed. If a replacement unit doesn't solve it, it could very well be the motherboard. CPUs very rarely fail, however that would be my third guess.
Any other failed components would still allow the CPU fan to spin, provided they are properly connected, which I would assume they were prior to opening the case.
Any other failed components would still allow the CPU fan to spin, provided they are properly connected, which I would assume they were prior to opening the case.