I re-installed GRUB through a Live CD and now it works. Which is good, but how on earth does GRUB get corrupted from me just turning the computer off and cleaning it inside?
@cirno Filesystem corruption of /boot perhaps? If you got the Grub prompt that means that grub itself didn't get corrupted.
@cirno The GRUB configuration may have been changed while the computer was on. It could have been corrupted for a while and you wouldn't have noticed until you restarted.
@cirno Static electricity? Cosmic rays?
Most likely something got corrupted while the computer was running, but it only came out when it tried to boot.
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