Manjaro not booting after system upgrade

[patziert]

I recently upgraded most aspects of my system, including moving to a new cpu and motherboard (AMD FX-8320 on AM3+ to Ryzen 7 5700X on AM4, new mobo: MSI B550-A Pro) and installing additional drives (NVMe-SSD, currently empty, plus new Blu-Ray drive, removing two old IDE optical drives). Now Manjaro no longer boots. Grub boots fine in CMS-Mode and so does Windows (including from Grub), but choosing Manjaro just gives me a black screen with no useful information.
I already tried chmod-manjaro and update-grub from a live stick, but it didn’t help. I think I’m out of my depth here.

[cscs]

You likely need to change driver config and more.
One place to start may be:

[HowTo] Resolve an unbootable Manjaro (black screen, login failed, cant boot, etc)

When we have problems gaining access to our systems it is difficult to gather information, let alone fix any problems. Here we will cover common causes and solutions to ‘manjaro wont boot’. TTY If your desktop does not load properly then you might still be able to use most, if not all, functionality by dropping to a non-graphical TTY. By default your system will have multiple TTYs, with each corresponding to an Fx key. Your desktop is assigned to one as well - most often F1. You can chang…

[Keruskerfuerst]

You need to boot either with

1. fallback initrd
2. chroot into the system and rebuild initrd

[stephane]

you need with USB live iso manjaro ,

• do a chroot
• rebuild img
• restore Grub entry

check this point before

UEFI doesn't see Manjaro bootable partition after installing Windows 10

I have three hard drives - An M.2 Drive, a SATA SSD, and a SATA HDD. With Windows 11 already installed on the M.2 drive, I installed Manjaro KDE Plasma (newest version as of last week) and I could boot just fine. Then, I decided I wanted a clean install of Windows 10. After backing up my files to the HDD, I used Manjaro disk utility to clear all partitions on the M.2 drive. Then, with the computer turned off, I physically disconnected the SATA SSD which had the Manjaro partition and the SATA HD…

For UEFi and /boot/efi

sudo manjaro-chroot -a
efibootmgr -v
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck    ( for UEFI + /boot/efi)
grub-mkconfig -o /boot/grub/grub.cfg 
mkinitcpio -P
efibootmgr -v
exit

[patziert]

Thanks, I checked through your guides an apparantly my problem is not Grub issue at all and rather a graphics driver issue. I also upgrade from an GCN-GPU to an RDNA2-GPU and it seems my system stubbornly tries to use the old ati drivers instead of amdgpu. Typing startx I get (EE) Fatal server error:(EE) no screens found. I have some trouble solving this though. The stuff I find by search all either seem to deal NVIDEA stuff or are don’t really seem to fit my case.