My friend built a computer with an AMD Sempron 2600+ and does not know what he is doing. He got the computer running but after a while the heatsink/fan combo fell off the processor because he just put putty on and stuck it on the processor, and the heatsink crushed some pieces of the fan. We put the fan back together with some plastic model cement, and put the heatsink back onto the processor (this time the right
way with the latches). The fan is working fine now but the computer won't run for him unless he puts pressure on the heatsink. I think that it's because there isn't enough thermal compound and the processor is getting too hot. I went into the BIOS and the motherboard sensor said that the processor is running at 75 decrees Celsius. I'm no expert but this seems way too high. The heatsink is on the processor very tight and he can't even seem to get it off now to apply the thermal compound.
May this be a lesson to newbies: if you don't know how, then get someone who does to do it for you.