The CPU fan on my computer broke. The screw holes of the replacement fan did not match up with the old screw holes in the heat sink (there were notches cut out of the corners, there was nowhere to screw the new fan to). I had to find a way to make my own screw holes for the fan, without impeding air flow.
Hillbilly MacGyver has nothing on this improvised momentary replacement power switch. We used a light switch, a rubberband (remember, it's momentary), and speaker jumper wires to connect directly to the MoBo.