PC not booting...don't know why

[oops]

First step. You should first do than stevo said

( or in the terminal: lsblk -f ... then ... e2fsck -Dyf /dev/sda# ... for the root partition and the /home )

Note that those partitions must be unmounted first, which is difficult on a running system, which is why I suggested the Live USB. Adding that feature to MX Boot Repair might help, though gparted can also do it from a GUI.

Yes, from a live USB of course (or a dual boot)

[MintHawk]

Before I do what you suggested, I opened it up, cleaned it, replaced the thermal paste on the CPU and was also able to fix the on-board WLAN card that was not working properly. When I booted up, there was a beeping sound (5 times, probably meaning CMOS battery, which I replaced).
After the beeping sound is gone, I still get a message for "bad USB cable...?" and have to boot by entering the root password again like I said above.
Now, I'm going to check what you said using the live USB.

[MintHawk]

Code: Select all

demo@mx1:~
$ lsblk -f
NAME   FSTYPE FSVER    LABEL      UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
loop0  squash 4.0                                                            0   100% /live/linux
sda                                                                                   
├─sda1 vfat   FAT32    EFI-SYSTEM CE4C-479B                                           
└─sda2 ext4   1.0      rootMX23   92893a7a-cfb9-44cb-ae87-fbaa7e9b4e48                
sdb    iso966 Joliet E MX-Live    2025-04-12-16-56-16-00                              
├─sdb1 iso966 Joliet E MX-Live    2025-04-12-16-56-16-00                     0   100% /live/boot-dev
└─sdb2 vfat   FAT16    EFI-LIVE   8089-2441                                           
sr0    

Anything else I should run?