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Cleaned my case about 15 years ago and didn't know at the time that the fans should be disconnected before cleaning them, only switched off the main power and pulled the plug. but the rotations of the fans caused by my cleaning built up a big amount of static energy in the board, and when I tried to turn on the PC afterwards I pretty much fried the motherboard. That was the end for the 233 Pentium MMX in my secondary PC...