The worst that I had is... I captured a virus once and kept it there just in case so after a few weeks i forgot what it was and opened it, 5 seconds later... SYSTEM32 is GONE....
one time i was lazy and just did some power unplugging *u know those 4 pin molex connectors on drives* the cable from a burner and seeing an awesome electric arc.......but ended up killing the power supply
i tryed turning two different kinds of power cables on the inside of the computer (floppy power vs molex, hey both had 4 pins) and did some home wiring lol. blew the motherboard and it wouldn't start. The BIOS wouldnt even show you just heard the fans start and a clicking/ticking noise. haha
funny thing is ive done custom wiring hacks like that b4 without problems (theres one in the computer im typing this one right now)
The machine I'm on has a modded PSU. The cable to the MoBo wasn't long nough to reach the board, so I took a dead PSU's cable and made it long enough lol. Took about an hour, cos the colors are different. Some faded, some utterly different lol. It works, so I can't complain. :D