Why the fan is running so loud?

[ksang02]

Recently i just bought a new 20" imac. when i try to switch it on today, the fan sound generated from the back of the imac seems louder then before. Didn't happen before. Is there anything wrong with it?

 

[Dangerous L]

Hmm. Have you installed any applications that boot on start-up? I used to get that when i had too many apps on start-up on my Mini.