Before you say anything, I know that there's this page where they cover it: http://www.metku.net/index.html?sect=view&n=1&path=mods/rottaflekti/index_eng However, those instructions are extremely poor, nothing about the resistor size or ohms or anything, nor how he was able to solder it to a chip. I'm trying to put mine via the PS/2 cables, I've dissected an old mice, stripped open the cables, and started connecting the fan wires to them randomly, trying to find which wire was which. none worked (yes the mouse was plugged in and yes I did reboot the comp before trying). It's a 12v fan not a 5v, I can't find any 5v fans where I live and parents are downright agaisnt ebay as they got charged 400$ by some dumb hacker (we got the money back). I also wanted to hook up an LED with mice (so the little holes for the air glows green). I've got a brand-new soldering iron, 2 green LEDs, solder wire and tinner, and 5 10-Ohm resistors (all from radioshack) for 21$ in all.