Hi everyone, I'm new to all this and found this topic by search engine. I seem to have an intermittent fault that is causing some whirring and grating noise. From what I've read here it seems that it's either a fan or the hard drive. The machine is just over 2 years old and is not in use 24/7. From your experience can you advise whether it's likely to be the fan or the drive or is it just pot luck? Also is there any way to tell which it is without the noise actually happening cos every time I go to investigate, it stops. The longest length of time this noise lasts is maybe 15 - 20 minutes and it may only happen 3 or 4 times a day and sometimes not at all for several days. It's driving me nuts and help would be appreciated.