Okay, I'm assuming the main reason that my 8440p randomly shuts off because of dust build up inside. Not positive though. I just got this, put in a used hard drive, installed my OS and everything. I noticed that the fan was constantly running, so it made me think it was overheating. My question is, what is the easiest way to deal with this? Do I take a shop vac and try to blow and suck out the dust from the vents? Or do I just take the whole thing apart and clean it with a q-tip and rubbing alcohol? The other thing I wanted to ask, is I happened to install a used hard drive into this. I was wondering if it is even possible for a hard drive to cause a laptop to just randomly shut off repeatedly? In the past, whenever there were hard drive issues I would get a BSOD, but with the 8440p there is no BSOD so I was hoping the hard drive was fine. Thanks in advance!