Windows update breaks dual boot setup

General system Kernel, boot, graphics & hardware
1

I have linux on one of my drives and windows on another. I am using the uefi boot manager. After any windows updates, I cant boot into windows, my motherboard bios or my boot manager. When I start my computer, it does not show my motherboard logo, it just shows “hdmi, not signal”, and then boots into linux without showing the boot menu. I cant boot into the bios with terminal commands in linux aswell. This has happened before and I fixed it by doing random things like cutting power to the pc for a short while and changing which display port my monitor is connected to.

I dont have a usb drive with me atm so I cant repair it using that so right now, I’m kinda stuck

Also, when I run “efibootmgr”, it shows, apart from my current linux and windows boot managers, two fedora boot managers. I installed fedora before wiped it from my pc so its weird thats still there.Honestly I have no idea whether that actually plays any part in this but thought I should give the info.

Update : now linux is not even turning on. The screen is just black

2

It sounds like you’re describing issues with the UEFI, which is persistent in non-volative storage on your MB. This is normal and requires cleanup (which is touchy and to my way of thinking somewhat dangerous, it’s not easy to restore a deleted EFI).
What I would do….though i hope someone else has better advise, nuke everything :slight_smile: (using efibootmgr) and restore everything (requires booting from some other device like your usb drive) for all OSs.
Also consider researching if there are BIOS updates for your MB.

3

Welcome to the forum :enos_flag: :enos:

Without knowing anything about what system you have, it will be difficult to troubleshoot this.
Not be able to get into the BIOS sounds a lot like a hardware problem of some sort i would say (corrupted BIOS comes to mind , but I am guessing here.). On another note do you share the efi (esp) partition with Windows, or did you create a separate efi partition when installing Linux. If sharing the wfi partition with Windows this can cause problems with the Linux bootloader. Also your efi partiton might be not large enough.