I've had this PC for 8 months now, and as yet I haven't cleaned out the inside of the case. I've noticed the fans have gradually got louder recently, infact annoyingly so, and I've been told if I blow out the dust build-up inside the case it will make a difference and quieten it. Is this true? Also, I don't have a can of compressed air - are there any DIY methods of doing it? I don't have a vacuum that could do it, but have a hairdryer - although I'd be worried the heat might cause a problem. All opinions much appreciated.