Cooling problems

[g4ry13]

I think i have a problem with my fans on the computer, i don't think they're coming in at the right temperature and the computer gets too hot and as a result crashes.

I heard you can change the temperature that the fans kick in at using the BIOS, how do you get to that and what do you do? (i'm not that good with computers - so a little detail would be appreciated).

What temperature would should one expect the fans to come in at? Considering i have a 2.4ghz processor, (i don't know if any other specs are relevant)

Thanks for the help
Gary