GRUB menu disappeared from dual boot PC

Hi! I’ve been using Manjaro and Windows on a single M.2 SSD for a long time now. And so far, I have not run into any major issues. But today, my PC suddenly shut down all by itself whilst I was using Manjaro. It kept shutting down, and it couldn’t even boot the motherboard. I discovered I had to clean my PC, and that resolved the shutdown issue.

However, when I tried to start the PC up again after that, it just booted straight into Windows. Usually the GRUB menu would show up and let me choose. Now I’m seemingly unable to boot into my Manjaro-partition. I assume I have to fix GRUB somehow, but I ofc have no clue how to do that. I could install Manjaro again from scratch, but that would probably mean loosing much progress in games that have obscure save-locations, and I would have to reinstall all of my programs, change settings etc etc…

I can give more info if that is needed.

Would
Restoring GRUB
help?

Can you post fdisk -l of the SSD ?

Ok, so I’m not that good at the terminal, but I’m trying to follow the steps from the link you gave me. Tnx a whole bunch btw! I try to run manjaro-chroot -a, but it prints out this in console:

grub-probe: error: cannot find a GRUB drive for /dev/sdb1. Check your device.map.
==> Detected systems
--> 0) ManjaroLinux
==> Select system to mount [0-0]:

Responding to the prompt with 0 or nothing returns this message:
==> ERROR: You can't mount 0!

Try 1 instead of 0.

This is the full printout from the fdisk -l command ran through an installation media:

Disk /dev/nvme0n1: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: KINGSTON SA2000M81000G                  
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 43FD719C-41D5-40FF-B6F8-9C39AC57D89A

Device             Start        End    Sectors   Size Type
/dev/nvme0n1p1      2048     206847     204800   100M EFI System
/dev/nvme0n1p2    206848     239615      32768    16M Microsoft reserved
/dev/nvme0n1p3    239616  613354744  613115129 292.4G Microsoft basic data
/dev/nvme0n1p4 613355520  614399999    1044480   510M Windows recovery environment
/dev/nvme0n1p5 614400000 1953523711 1339123712 638.5G Linux filesystem


Disk /dev/sda: 2.73 TiB, 3000592982016 bytes, 5860533168 sectors
Disk model: ST3000LM024-2AN1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 18E57FCB-19DF-4762-A531-BEAD4EC577A2

Device     Start        End    Sectors  Size Type
/dev/sda1   2048 5860532223 5860530176  2.7T Linux filesystem


Disk /dev/sdb: 3.74 GiB, 4011851776 bytes, 7835648 sectors
Disk model: DT 101 G2       
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Device     Boot   Start     End Sectors  Size Id Type
/dev/sdb1  *         64 5777399 5777336  2.8G  0 Empty
/dev/sdb2       5777400 5785591    8192    4M ef EFI (FAT-12/16/32)


Disk /dev/loop0: 27.36 MiB, 28692480 bytes, 56040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop1: 370.19 MiB, 388173824 bytes, 758152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop2: 1.65 GiB, 1776128000 bytes, 3469000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop3: 662.5 MiB, 694681600 bytes, 1356800 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
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Thanks! Ok, I’ll see if I can keep following the linked guide then :smiley:

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