I seem to be having an odd problem with my Mid-2011 iMac quad core i5 which I can not seem to isolate and fix. When the machine has been sitting off for an hour or more, I can boot it log in and start working. Usually within 10 minutes (regardless of what I'm doing), it will restart on its own. Upon restarting, it might get back to the login, but then restarts again, and again.. eventually I have to hold the power button down to shut it off.
I've tried resetting the SMC / PRAM, booting with just the original RAM, and using different power cords on different outlets -- all seem to get the same result.
I have replaced:
1. The graphics card
2. The logic board
3. The Power Supply
Both the logic board and power supply were purchased used off eBay and while the descriptions both said they were pulled from working units, I have no way of being 100% certain these aren't flawed.
Regardless, I wanted to put this out there and see if it was a familiar pattern to anyone. The one thing I have NOT tried is booting in Recovery Mode but was planning on making that my next step.
Is there any place I should be looking for errors? Any way to further isolate the problem? I am at the verge of throwing in the towel but this was such a solid machine up until about 6 months ago and I would like to try to salvage it if I can.
Thanks.
I've tried resetting the SMC / PRAM, booting with just the original RAM, and using different power cords on different outlets -- all seem to get the same result.
I have replaced:
1. The graphics card
2. The logic board
3. The Power Supply
Both the logic board and power supply were purchased used off eBay and while the descriptions both said they were pulled from working units, I have no way of being 100% certain these aren't flawed.
Regardless, I wanted to put this out there and see if it was a familiar pattern to anyone. The one thing I have NOT tried is booting in Recovery Mode but was planning on making that my next step.
Is there any place I should be looking for errors? Any way to further isolate the problem? I am at the verge of throwing in the towel but this was such a solid machine up until about 6 months ago and I would like to try to salvage it if I can.
Thanks.