well im quite an expert at such matters. You see heres what you do, get some cherrie bombs and a couple gallons of lighter fluid... well you get it
Also, once i kept on pressing the power button again and again... and then there was that time when i spilled soda all over the motherboard and i got really pissed and i was gonna wash it untill i realized that that wasnt such a good idea.
and then my dog pissed all over my comp...but that didnt do much...nothing like the time i was replacing my ram and it got stuck and i was like uh oh so then i pulled really hard and well it broke in half..
i think any of those things will cause your computer to freeze... but all you really have to do is open the circuit with the motherboard and the power supply you can just cut out a segment of the actual wire and put it back so the to ends dont touch, im pretty sure that would cause it to fail.