Mac Pro screen stuck on black screen

I just had the power supply replaced because I had no power and it was bad. Now when I start up all I get is a black screen! I am using the same monitors connected the same way as before. The strange thing is that at the shop where the power supply was replaced it starts up with the proper image -- they can't find anything wrong. I am Baffled!!! I need some HELP!!! Thanks in advance. Harold


[Edited by Moderator]

Mac Pro, macOS 10.15

Posted on Mar 23, 2025 3:18 PM

Reply
8 replies

Mar 24, 2025 11:43 AM in response to Hal Frederick

The simplest thing your Mac can do to show a default picture on the display is to start up in Startup Manager, whose code is all in ROM, and no drives need to be working to get the display to work.


Hold Option at startup, and it will, over the course of several minutes, draw a gray screen, then add an Icon for every potentially bootable drive it discovers.


provided you can get something, it can be changed to a setting that works for your display

May 13, 2025 11:57 PM in response to Hal Frederick

Your first step should be to secure your data, issue likely isn’t with the Mac itself but with your local setup, maybe the display connection.

Double-check that all cables are securely connected and that the correct input source is selected on your monitor. Try using a different display cable or port, and if possible, test with a different monitor.

Mac Pro screen stuck on black screen

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