Fan On All The Time Options

[alreed]

Hi,
I've just bought a new MacBook, and been thoroughly enjoying using it for many things, but since last week the fan has been on practically non-stop. Of course it eventually stops when I put it to sleep, but within a minute or two of use it's back on again.

This is a problem if I want to use it to record audio, and as a music workstation. I'm thinking of taking it back while the warranty is still valid, but I'd rather not now that I have all the things I want installed on it.

My iBook's fan didn't come on nearly as much, and I used it the same amount. If anyone can help, I'd appreciate it.