iMac won't boot. Logic Board? GPU?
I have a 27” 1312 iMac, with 16 GB of RAM with a replacement SSD for the original HDD.
All has been working fine until today. My system stays on 24/7, I went to use it and it had shut its self off.
Tried a re-boot, Apple logo appears, progress bar appears, gets halfway through and then solid grey screen, then the system reboots itself and will not stop unless turned off.
Cannot boot into safe mode or recovery mode. Reset PRAM and SMC. Tried external drive with OS, sees drive(s) and continues with external boot, but fails at same point (external drive boots MacBook no issues).
Apple support had no explanation.
Removed SSD and was able to boot my MacBook from the iMac SSD. Had iMac desktop so it’s not a drive issue. Installed new OS on a new SSD and installed to do tests.
Cannot load Apple diagnostics from iMac, but internet diagnostics loaded. Only issue was the HDD sensor as I’ve replaced with SSD.
Closest Mac store is hours away. Before I pack it up, just looking for suggestions. One store said it may be logic board. Another said GPU.
Been told that Apple can’t get parts as it is “Vintage”.
Is the machine salvageable? Thanks.
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