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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Screen stuck on Low Resolution

Hi.

Video card is GeForce GTX 660M (if needed).

Upgraded HD to SSD and decided to refresh Thermal Paste as computer is 8 years old and hasn’t been open (screen adhesive seems to be original). Now screen resolution is at 1280x720, everything is pixelate. Even Apple logo on startup. Going to System Preferences - Display shows Only resolution mentioned above. No Other Resolutions are listed.

Did I somehow damage Video card by reapplying Thermal Paste? I work in computer repair shop so have done it zillion times.

Thank you for taking a look.

Answer this question I have this problem too

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Did you try running diagnostics?

Restart your system and press the D key to enter

Reference: Mac startup key combinations

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Diagnostics won’t run, it won’t even start (held D key for solid 2 minutes). Just white screen. Recovery - loads, OS - loads and works, Diagnostic - won’t.

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@onetailbeast - Try using a USB keyboard

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Was using USB keyboard.

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Had the same problem. Tried everything from reinstallation, resetting PRAM, SMC, etc. Been on call with Apple support for a half an hour. Unable to run diagnostic, not even remotely or from a flash disk. Nothing helped. Brought the iMac to an authorised service centre here in Brno, CZ and they quoted me €700 for a new LCD. Which is a basically price of the whole iMac…

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onetailbeast will be eternally grateful.
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