The fan has been progressively making a racket for the last 3 weeks, so yesterday I tried to locate which fan it was as there a 6 in this computer. As I slowly unplugged each one and turning the computer on and off each time, the computer would not turn on after about the fifth time. I have checked the power pack with a paper clip test and it started the fans. I have unplugged in turn , video card, dvd drive, hard drive, ram cards, took a cooling system that was sitting over the CPU. The whole time I never touched the circuit board. Nothing. I am not a computer tech but having a go as I desperately need this computer running asap I have tons of work to do. I am lost for solutions now, what can I do do next please.