I was working on the computer when all of a sudden a "a network cable is unplugged"-message popped up. I was listening to music with Winamp at the time and I noticed the sound also became garbled for a second right then.
I checked the network connections and the NIC just said "disabled". After a reboot the NIC wasn't even in the list anymore!
I reseated the card and magically enough it started working again..
What could have coused this? Power surge?