Help resetting the EFI Boot

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Level 1

4 points

Help resetting the EFI Boot

I tried to change my EFI Boot partition in terminal to get the boot screen on a non flashed GPU, and after doing so, it won't reboot properly when you select restart. If you shut down and reboot it works fine.

I've since switched to a different GPU that is flashed but want to get rid of this restart problem.

This is in a MacPro 5,1 12-core 3.33 GHz running Mac OS 10.14.6 (Mojave) using an AMD Radeon RX480 8GB GPU for which I do get the Apple Boot screen.

One other thing since I changed the EFI boot it always comes up with the choice of startup disks without holding the option key.

Posted on Jan 21, 2022 10:15 AM

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Answer 1

BDAqua

Level 10

250,683 points

Jan 21, 2022 2:42 PM in response to bobgrey

Have you done a PRAM reset, CMD+Option+p+r...

http://support.apple.com/kb/HT1379

In fact, do 3 in a row, takes a bit of time.

Intel-based Macs: Resetting the System Management Controller (SMC)...

http://support.apple.com/kb/HT3964

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Answer 2

Jan 23, 2022 6:32 PM in response to bobgrey

It would help to know exactly what you did to your system. A link to the article you followed or a list of the exact steps and commands.

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Answer 3

bobgrey Author

Level 1

4 points

Jan 21, 2022 4:21 PM in response to BDAqua

I have done a PRAM reset and I had already done the 3 in a row with no luck.

I just tried 3 Different cards in this 12-core and they all do the same thing.

A then tried them in a 6 core and it boots perfectly upon restart. Same exact setup but on a 6-core.

I'm beginning to think that it's the 12-core configuration. I've tried removing just about everything I can think of.

Bob

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Answer 4

bobgrey Author

Level 1

4 points

Jan 21, 2022 10:16 AM in response to bobgrey

Also ... booting in Recovery doesn't work.

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Help resetting the EFI Boot

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