I just got my refurb G5 in the mail today and as soon as I turned it on, the clicking began. I tried several restarts but the same thing happened. I reset the vram and everything else, and ran the hardware test (as Apple support instructed me to do) and it still keeps happening. I did not open the case, but if I look through the front grill, I can see a fan in the lower left hand coner attemempting to start. It keeps trying to but it clicks and then stops and repeats. Apple support suggested I take it to an Apple store for help, but I do not want to drive a half hour each way if the problem can be fixed easy. Any suggestions? Is this a quick fix, or should I not bother fooling with my G5 and take it to the Apple Store instead?