I've just had another problem with my 360, the second in nearly 3 years. It just stopped reading discs, so I opened it all up, opened the disc drive and re-aligned the laser and put it all back together again. Now the first problem was the dreaded 3 RROD, I fixed that with a modified X-Clamp fix by just using 1p's, the fan was louder than usual and the loading was quite noisy. But since about 10 minutes ago of me fixing the disc drive, the loading is quieter, the fan is still obviously the same as before as thats caused by the penny fix.
I've never had any electrical training or mod PC's for a living (I've installed the odd motherboard and GFX Card but nothing major). Think that deserves a well rounded pat on the back :).