scrambled image on screen
Unit powers up fine but image is scrambled. I tried patching 2nd monitor & it does the same. Any ideas?
Same scrambled video on external monitor = bad news. Probably a faulty graphic processor unit and that means a logic board replacement. Try all usual troubleshooting procedures (pram reset, PMU reset, etc). If nothing restore the video then replace the logic board.
Here's a link to troubleshooting steps:
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