Hi everyone, I have noticed the fan on my Toshiba L850 laptop has been buzzing away at top speed for a few weeks now. I think the problem is a lot of dust in the power supply. If I look through the cooling vent there appears to be quite a bit of dust in there. I have tried blowing it out without any luck. I am not confident taking the case off to clean it out and don't really know what is involved. Can anybody give some advice here? Where do I start and what precautions do I need to take?