Qubes OS 2.4.1 Crashes at plymouth-quit-wait.service

[apparatus]

@disp10

It only worked on my old one

Then most probably it’d have the same issue in Qubes OS 4.1.2 as you have with Qubes OS 4.2.1.

@disp10

Even when I told my SSD from my dead motherboard and plopped it into the replacement motherboard it still showed no boot menu. And Ive tried reinstalling several times now.

You need to manually add EFI boot entry after switching the motherboard for Qubes OS 4.1.2. This issue was fixed in Qubes OS 4.2.1 some time ago.
You can fix your EFI boot issue like this:

BIOS Update That Will Break Boot

If you use uefi : get a qubes os media installation. boot to qubes os rescue mode. skip to shell. [shell] : efibootmgr -v -c -u -L "Qubes OS" -l /EFI/qubes/grubx64.efi -d /dev/nvme0n1 -p 1 reboot change -d <which drive?> and -p <which efi partition?>. if you want you can make sure first by issuing efibootmgr -v in dom0