Mac Pro 4.1 Tech Manual Trouble Shooting When should you get a GPU and EFI diag light

By Guest MikeDavies99
November 6, 2021 in Archives

https://extremetechsupport.com/topic/1207863-mac-pro-41-tech-manual-trouble-shooting-when-should-you-get-a-gpu-and-efi-diag-light/

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Guest MikeDavies99

Posted November 6, 2021

Hey all

Mac Pro 4.1. Trying to follow the minimum config testing from the Apple Tech manual.

The power light comes on, fans spin but no boot, no chime. The power button if pressed will put it sleep like normal and if pressed again the light goes back on steady. It sat for 3 months after working fine. Replaced the Battery as it was low.

On page 35 it says, with all drives, video ect removed and the processor cage installed, after pushing the power button, when you push the Diag Button you...