Hi I've a 2009 24" iMAC 3.06 Core 3 Duo, with 2 GB ram, I'm getting pinwheels and grinding noises from the iMAC. I think the grinding may be the hard drive (?) but note sure - would adding ram would help things out? Deadline pending as Crucial have 10% off sale !! Also has anyone maxed out the memory on an iMAC above the manufacture's recommended level (as highlighted by Crucial)? a basic question but .... need advice ..... thx.