Stared out w/ a PC that won't boot. NOTHING happens, no POST, no nothing.
Tried a different (known good) power supply, same thing.
Started unplugging all extraneous devices (like the CD drive & hard drive) just to see if I could even get the CPU fan to spin. No help.
CLUE #1: With nothing from the power supply connected to anything except the main 24-pin MoBo connector the fan does now spin BUT if I also connect the 4-pin 12v aux power connector to the MoBo the fan again will not spin. (This happens with either power supply.)
QUESTION: Is my most likely failed component a MoBo or a CPU? (And w/o out a replacement CPU how can I test this?)