So, today I disassembled this horrible machine that is PowerBook G4 12". Swapping hard disk was relatively easy, didn't even have that much problems with power switch and microphone cables.... but, I cannot get that heatsink off. Those two screws with spring just seems to be pain. When I get frustrated I also start to lose my precision and patience much faster than average person, I'd say. I used some force and managed to get the left one to come off, but I think that something else did come off too, maybe the thing where the screw is attached. The right one is still in place and that bloody heatsink cannot be removed. I did put the whole machine back together just to see if it still works and it does, however heatsink is currently not in place well enough since the machine runs hotter than before, I don't even have OS installed but the fan revs up even during installation which I think it didn't do before. My second Tiger disc is missing so I cannot complete installation at the moment and the DVD drive cannot read my Leopard disc. I tried USB boot before and it failed even though it started to read the stick... so missing installation media pisses me off even more! My goal was to swap hard disk (which I did), reapply thermal paste and try clean the optical driver (both of which failed, atleast for now). I have disassembled couple iBooks before and they had similar screws, somehow I didn't have any problems then so I am amazed. Any tips? I can't remember how it looks under the heatsink, but I guess the left screw / mounting might be damaged and cannot be repaired?