Don't trust service men

Finally my laptop warranty expired and, after spending some time with google to find the service guide, I opened the damn thing. It's been overheating (again), so I thought it's time to do the fan cleaning... Turned out the fan and radiator are quite clean, the problem was that some dumb moron from the "authorised" service didn't put thermal paste between the cpu and the heatsink!!! This must've happened the last time I got it cleaned in the service (and they charge a lot for it). When they returned it to me, the fan wasn't working at all - they just forgot to reconnect it.