My computer will not boot up any more, I was surfing the net and it started making this horrible grinding noise, so I switched it off and when I turned it back on it wouldn't boot. I tried belting the pc tower and although the pitch and tone of the grinding noise changed the problem remained. I think I will need either a new hard drive, processor or both but I am not sure what. I looked inside and the noise is definitely coming from the hard drive as I disconnected it and the noise stopped. I know very little about computers so if anyone can help but needs further information I will try my best to supply it. If anyone could tell me if it is the processor or the hard drive that would be a start as I don't want to shell out for stuff I don't need. Also if anyone can tell me where the cheapest place to buy this kind of stuff is or has either one spare that they want to sell, it would be a great help.