How to fix boot when grub is installed and grub is broken?

Situation is I have a PC with windows 11 and windows 7 and linux, all on different drives

years ago, a boot drive got corrupted containing grub and at boot it only gives grubrescue> prompt, when that drive is selected in bios to boot from. And that drive with installed grub is my windows 7 hard drive with linix.

I normally boot fine from bios selected drive into win 11.
I can only now get into win 7 when booting from supergrub rescue disc in the usb port and selecting windows 7

There must be a way to fix the boot record in windows 7?
Right now I am in win 7 posting this here

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perhaps easy way is reinstall Mint on one of the partitions

samuria said:

Try fixing grub How To Use GRUB Rescue Commands To Fix Boot Failures In Linux

I thought of using that before.
I am a little concerned if will it also write grub into all the other 3 drives, as "I dont want that to happen

Currently I can only boot that disk using supergrub disk. But also I plan to look thru this old win7 and see if anything is worth keeping.
I might wipe the disk and install win10 pro as the hardware already uses win 11 pro activated by hardware id


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Boot-Repair - Community Help Wiki (ubuntu.com)

does say it can remove grub and restore mbr to windows
Boot-Repair also has advanced options to back up table partitions, back up bootsectors, create a Boot-Info (to get help by email or forum), or change the default repair parameters: configure GRUB, add kernel options (acpi=off ...), purge GRUB, change the default OS, restore a Windows-compatible MBR, repair a broken filesystem, specify the disk where GRUB should be installed, etc.

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may also try this here
How to reinstall GRUB to a different boot drive - Ask Ubuntu

By the time you figure out how to solve this with Boot Repair, Grub Rescue etc. , you could have reinstalled mint. what does it take, 20 minutes or so? Take the easy way. Unless you want to learn how to solve these problems.

The best rescue program I have found is Rescatux. It should solve this one way or another. It even can set a new windows password. Very handy.

Rescatux

michael diemer said:

By the time you figure out how to solve this with Boot Repair, Grub Rescue etc. , you could have reinstalled mint. what does it take, 20 minutes or so? Take the easy way. Unless you want to learn how to solve these problems.

The best rescue program I have found is Rescatux. It should solve this one way or another. It even can set a new windows password. Very handy.

Rescatux

Maybe will try it later.
Yeah, a learning experience, just don't wish to learn the hard way, but this disk has nothing super important
Softwares on it is a history disk sort of, surviving transfers and clones. I have had it long time through several upgrades from earlier windows versions going way back, yet have not viewed contents in a few years.

Because of that, I have kept it as I did not want to go thru it all, been busy.

I'm unclear as to your precise configuration. It sounded like you have Widows 11 and mint on the same drive. Best to have dedicated drives, but you certainly can do it the other way. just more potential problems.

I have had it happen that in order to boot an OS, another drive had to be connected. So part of the boot process involved that drive. No idea how that happened. But it did. Also, sometimes when reinstalling, something may be messed-up on the Linux partition. To be sure, it's a good idea to just delete that partition, so you have only Win 11 on that drive. No other partitions. Then just install reinstall Mint, and it should be fine.

michael diemer said:

I'm unclear as to your precise configuration. It sounded like you have Widows 11 and mint on the same drive. Best to have dedicated drives, but you certainly can do it the other way. just more potential problems.
I have had it happen that in order to boot an OS, another drive had to be connected. So part of the boot process involved that drive. No idea how that happened. But it did. Also, sometimes when reinstalling, something may be messed-up on the Linux partition. To be sure, it's a good idea to just delete that partition, so you have only Win 11 on that drive. No other partitions. Then just install reinstall Mint, and it should be fine.

I have 4 drives, main one win 11 pro
Another drive has win7 ultimate, mint and ubuntu
the other 2 drives are data drives, one for WMC running off win 11 pro, the other a cloned copy on win 11

grub is only installed on disk 2, like to keep it like that

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Another thing to try would be to use Easy BCD, and set it up to recognize the Linux partitions. however, I have a feeling it would not work.
You probably need to reinstall Grub on either the mint or the Ubuntu partition. If that doesn't work, you may need to write a whole new boot sector. I had to do that once. A bit complicated, but I just found a good tutorial and it worked.

This is definitely fixable, you just need to keep trying different approaches until you find one that works. The mint or Ubuntu forums would also be a good way to get advice. I would use the Mint one personally.

michael diemer said:

Another thing to try would be to use Easy BCD, and set it up to recognize the Linux partitions. however, I have a feeling it would not work.
You probably need to reinstall Grub on either the mint or the Ubuntu partition. If that doesn't work, you may need to write a whole new boot sector. I had to do that once. A bit complicated, but I just found a good tutorial and it worked.

This is definitely fixable, you just need to keep trying different approaches until you find one that works. The mint or Ubuntu forums would also be a good way to get advice. I would use the Mint one personally.

That worked real well....

Cant upload pics here but here are the total fails both programs are that people say fixes all grub issues
and running apt-get failed to get the needed files, they dont exist at zerobounce.net...

Shared album - Scott Downey - Google Photos

Shared album - Scott Downey - Google Photos

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I did reinstall mint finally and that fixed grub

Like I said, by the time you try this or that fix, you could have reinstalled Mint. Reinstalling Linux is not a big deal. Reinstalling windows another story!

The various tools to fix grub usually do work. but usually means not always. Your situation was one of the "not-always" ones.