Have you tried resetting the jumpers or removing the cmos battery?? The cmos battery looks like a little coin. Remove it for about ten minutes and reinsert it and it will put BIOS back to factory defaults and hardware.
Just push the tab down holding the battery.
I tried resetting the cmos using the reset jumper, but I suppose I will try removing the battery.
Might have that burn something else when u soldering it back (pcb has multiply layers)
I missed the part about the ic falling off. That gotta suck because it voids all warranty moding the fan.
Yeah, I don't think there's much I can do but buy a new one.