I once had a call to go help a user who was having "mouse issues". The user reported that he couldn't use his external mouse to move the cursor but the lights on his mouse were on (trackpad on laptop was working fine). Headed on over and he tells me about how he has unplugged/plugged it in, tried reinstalling drivers, etc. I pick up the mouse - one of his colleagues had played a prank and taped a bit of paper over the sensor. Removed the paper and the mouse was fine.
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