iMac displaying abnormal picture shortly after powering on
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iMac 27" - Late 2012 Model# A1419
Customer said they had the motherboard previously swapped out at another repair shop.
Displays abnormal picture with lines running vertically and horizontally.
It will eventually get stuck on a loading screen at what appears to be the half-way mark.
Tried resetting NVRAM or PRAM, booting from USB, starting from internet recovery, safe mode, and recovery mode.
I have also swapped out the hard drive with another freshly formatted drive and tried to boot from USB to do a fresh install of a new IOS.
I swapped out the RAM and got the same issue.
It appears to always end up on the final display picture below.
I have tried to enter the verbose mode as well, but it appears to either ignore the command and continue to the last display picture posted below.
When selecting WIFI in internet recovery the abnormal display will not be present.
Noticed a 3rd party power cord that the customer was using and not sure if that would affect anything.
I'll post the fix when or if customer decides to get it repaired.
UPDATE:
Customer has agreed to have motherboard replaced, so if that solves the issue I will return with an update.



Asked by clayton bivens
(21 rep)
Mar 10, 2022, 09:38 PM
Last activity: Jul 29, 2025, 01:07 PM
Last activity: Jul 29, 2025, 01:07 PM