2011 iMac 27" EMC2429 Random Reboots
I have a 2011 27" iMac (EMC 2429) that continually reboots. It is so frustrating. Computer may work for 5 minutes, or may not even let you log in.
In May, the Apple Store diagnosed the problem as a bad fan. Two weeks later, the problem started back up. I deployed for a couple months and didn't want to deal with the issue. When I got back I decided to try to figure out why it still wasn't working.
The hard drive was replaced with a fresh OSX install (Sierra). Problem persists.
Then I took back to Apple Store. They tested all the hardware. Although the video card was tagged as a recalled card, it passed all tests. They determined that the logic board needed replaced. After getting iMac home, it immediately did a reboot after attempting to login.
I called the store and they said it could be a bad power cord. I bought a new one and used it on a separate power location and... Problem persists.
I have tried taking all Ram out and using only one stick at a time to see if that's the issue. Nope. What could be the problem???