Watch out for the pulled cable in an old Dell tower, that one cost me 45 minutes
Last Tuesday I was swapping a power supply in a dusty Optiplex at a client's office in Dayton and yanked a SATA cable loose from the board by accident. Instead of panicking I shut it down, reseated the cable, and ran a full drive check to make sure nothing got corrupted, which took 45 extra minutes but saved me a callback. Does anyone else keep a spare SATA cable in their bag just for this kind of thing?