Boot issue after deleting dual boot

hello guys. I have a problem booting my Manjaro Plasma installation. I had a dual boot with win10, where win10 was installed on a nvme SSD and Manjaro on a sata3 SSD. I had no issues with dual boot itself, grub etc worked fine.
I deleted the partitions on the nvme and win10 completely. turned the system off and uninstalled the nvme ssd from the motherboard. then I started the system and booted to Manjaro with no issues over the grub menu. 1 day later the system hangs right after the grub menu, choosing Manjaro for boot hangs the system.
I did not mess with any configuration files, so what could be the problem?
did I miss something?