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Completely black screen tried power sequences and resetting PRAM but no joy - any ideas please.
iMac Pro
There are a few things in here. Make sure you follow the steps carefully.
One guy put a flashlight to the apple logo on the back, and he was able to see his screen to log in, then the screen kicked on. Another guy used a keyboard shortcut. Hope this helps.
If your Mac still doesn't turn on, please contact Apple Support.
iMac won’t turn on
