Unfortunately I can’t use the front ports on the case because the cables for it don’t reach the plug on the motherboard.
Haven’t thought to try OBS, I’ll have to give it a go tomorrow!
I do appreciate the attempt to help me troubleshoot it, even if unsuccessful!
These last two comments seem to point that way:
https://discourse.gnome.org/t/gimps-master-branch-string-freeze/22895/22