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Computer boots into Ubuntu just fine, but skips the bootloader screen

Hello,

I'm really keen to give my Mac Pro (Mid 2012) a second life as a Plex server. The problem is, last time I was tinkering with it (2 years ago), I loaded Ubuntu on it and messed up the bootloader while trying to configure dual boot with rEFInd.

This would all be fine, but I additionally forgot the password to the Ubuntu user. This means that I am unable to repair the bootloader, which would allow me to load a new OS onto the computer, along with a known admin password.

I'm wondering if my GPU also has issue as only the MiniDisplay Ports work, and not the DVI, which could lead to issues displaying the bootloader screen upon startup.

I've tried NVRAM reset (chimes ones, black screen). I've tried holding Option when I boot (still black screen). I've reseated the RAM. It's just a strange problem. I figured I could just load a new OS on, but the only thing I get is the Ubuntu splash screen and then Ubuntu's desktop (I set it to automatically log into the user, but I have no sudo access).

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Load a Mac OS onto another drive using a Mac and then put it into one of the bays and boot from it. MacOS:X 10.5.6 through MacOS:X 10.11.6*

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I've tried a USB media installer.

I'll try to load macOS onto a hard drive, pull out the Ubuntu partition, and see if that forces it to boot from the macOS drive. Then report back. Thanks you!

von

BTW I use an OWC Accelsior S

2.5-inch SATA 6G SSD to PCIe Expansion Card to double my speed from the hard drives bay 3.0G to the PCI slots 6.0G plus the added speed of an SSD. Plus it's cheap at $27.00, even with an added 1TB drive it's only $85.00 (https://eshop.macsales.com/item/OWC/SSDA...) a 2TB at $143.

https://eshop.macsales.com/item/OWC/SSDA...

von

Way ahead of you. I have three of them in a RAID 0 config backing up to a HDD hourly. I still have not had a chance to load Mac OS X on to a drive, it's on my list. I want to save this machine and give it a second life! It's a lot of material to go into the trash otherwise.

von

Keep an eye out on this Q& A. I'm taking one of my Pros to Monterey:

OpenCore Legacy Patcher vs Dos Dudes Patchers Also going to a faster wi-Fi & BlueTooth using this adapter and a BCM94360CD

https://www.amazon.com/gp/product/B07T5B...

von

Ultimately, I have taken a macOS (High Sierra) disk from an alternate Mac, attached it to one of the bays, and have been able to load into the OS. Still no bootloader/the option key does not work.

I’ve also swapped out the clock battery, swapped out a GPU, taken out a couple sticks of RAM that might be bad, successfully reset the NVRAM/PRAM, and still no dice.

von

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Randall B wird auf ewig dankbar sein.
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