8KNXP Rev.2.0 Northbridge Fan Problem

The Northbridge fan on my mobo has started making a kind of grinding sound
during the boot process. After windows has loaded it goes back to the normal
noise it's supposed to make. Initally I thought the noise was coming from
one of my hard drives as it sounded like when the bearings go and even went
as far as buying a new one! Anyway, this mobo is only a couple of months old
and I was wondering if this is an easy thing to fix or should I take it back
to the shop?

Cheers.

Si