iMac Power Issues - Light On, Fan On, Fails
I have an iMac from 2005, model #A107, a refurb with the serial #RM5461SESDZ. For the last few weeks it was having some strange sleep patterns--as in, it wouldn't go to sleep when you tried to put it to sleep. Before I could investigate further, today it simply died and won't turn back on.
Rather: when I turn it on, it sounds like it is trying to boot--the light comes on, the fan spins, and then it sounds like it is getting hot and the fan spins wildly and then it dies. The screen does not come at all--no question mark, no nothing.
I removed the back and dusted it all with compressed air. I did all of the restart attempts, removing plug, etc. I pushed the power supply reset button. On the motherboard I tried resetting the SMU--same thing. There are four lights (?) and when I power up the two to the left light up.
So, question: does this appear to be a power supply issue? I'm happy to purchase and repair myself, but I have no idea if this diagnostic is leading me in this direction.
And I did look at the capacitors and noticed no bulging or leaking.
Any help or advice would be GREATLY appreciated. Thank you!