Sudden Random Power Down. Logic Board? Newer model boards?
My iMac will suddenly and randomly power down in the middle of use. There is no warning, and no coming back from the power off state an indeterminate amount of time.
I've tried resetting SMC and changing power cords with no success.
When it's working, it can go several days with no problems, but will always eventually do the power-off thing. I've had one local shop (non apple) suggest it's the logic board (which I'm inclined to believe). I didn't repair it then because I didn't have the money. Now, I'm looking to get a replacement logic board.
(This will be my first modern Mac repair, but I'm no stranger to IT innards, soldering irons, etc.)
To my questions:
- How likely is it to be the logic board? Anything else I should investigate?
- Logic boards for EMC 2639 are getting hard to come by. Where might I go to get one?
- Is there any chance a different logic board would work (say, from EMC 2806/2834)?
- Is it even worth doing this?
Is this a good question?