Screwed screw
Sometimes you take things apart so many times that one day you realize that when you really do need to take that pc apart to really fix it that a screw is screwed... On my little innocent "netbook" (i dislike that word) I waited a while before I decided it was time to bring out the big tools and sort this one out once and for all.
Basically I took the drill to the screw, using 2 and 3mm shanks I drilled "carefully", the goal being just to drill out the ring part of the head. To my surprise the screw came out on it's own before I was done...
I now can set aside - temporarily - the idea of buying a replacement.. instead, I'll need to get replacement parts, but that's another story.