iMac keeps rebooting at startup
On startup my mac has a gray screen, the apple and progress bar come up and then stops halfway through. Then it waits a few minutes and tries to reboot. I get the same thing.
I put a new HD in, thinking that was the problem and installed new MacOS.
Was working fine for 6 hours and then the screen went gray again and it keeps rebooting.
Hardware test says its all okay.
- Tried safe mode.
- I can get it to come up in Target Disk Mode.
- Zapping NVRAM
- Reset SMC
Any other suggestions?
Is this a good question?