I have a 2.8 Eightcore standard with the 8800 and BTO 500GB HDD (the only drive present) and i have only used this machine seldom since ive been off site for work and travel and had only this machine since June 30th 2008 I took the machine out of the storage in my home and set it up and notice it started making a really LOUD BAD humming sound, it seems to be coming from the top of the case and doesnt seem to be coming from the PSU more around the optical bay area. I opened it up and moved the machine then it stopped but once i moved away it did it again. i tried several outlets, UPS' and Surge Protectors etc etc to no avail. hmmm.. and this machine hasnt been stressed at all mainly a few photoshop sessions and some aperture but thats about it. any advice or tips? thanks!