iMac does not boot ends in white screen and restarts
Hello people
I'm working on a friends iMac (iMac 12,2, Quad-core i7 3,4GHz) that does not start. The loading screen starts and loads up to about 80% then it all goes white for a while and then it restarts.
I've already tried different things:
- Installing the hard-drive in another mac: starts perfectly fine
- Installing another hard-drive in this broken mac: same problem as before.
- Resetting PRAM NVRAM reset: no result
- opening recovery mode: Recovery mode does not start, apple loading screen appears after loading white screen and restart.
- Checked some swappable parts (optical drive, Power supply, RAM, Battery): no result.
- run Apple Hardware Test: no errors
- run Verbose Mode: screen recording here (dropbox link), last Line is: AppleHDAEngineInput: : performFormatChange (<ptr>, <ptr>, 0)
I hope someone can help me, and that it is not a broken mainboard...
Kind regards
iMac Line (2012 and Later)
