Help! I just bought a Power Mac G5 off craigslist and it has issues! 1. It has an annoying high-pitched whine. Occasionally it whines and beeps. Usually only happens when I do something (anything) on the machine (other than typing). So scrolling through webpages, moving windows around, mostly involving screen-redraws. The sound has lessened since I turned Processor Performance to "Highest" and is reduced even further at "Reduced" Through trial and error and replacing components, I don't think it's the hard drive and I don't think it's the graphics card (GeForce FX 5200). Any ideas? Could it be a fan? Is there any down side to running the G5 at "reduced"? 2. It won't sleep. Well, I should say it will sleep, but it won't wake up. Shortly after entering sleep mode, the fans go on full blast and it won't wake up anymore. I have reset the PMU and PRAM and unplugged it for days, no luck. 3. The sensor that senses when the plastic cover is on doesn't work properly. I have shoved a piece of paper in there to break the beam, but it doesn't always work and I have to wiggle it a couple of times if I bump the tower. Any instructions on how to remove/disable it? 4. There also seems to be a regular low-sounding beep at 1 second intervals. I have no idea what this might mean. Is this bad? 5. Lastly the fans seem to be making a "chugging" sound, not the smooth spinning sound. Any concern here? Of note the G5 was very very very dusty when I got it. I used a lot of compressed air to clean it. Could I have damaged something in that process? Machine specs: Dual 2.0 G5 "Omega" 1 GHz FSB Firmware 5.1.4 3.5 GB RAM (2x 1GB, 2x 512MB, 2x 256MB) 160 GB HD Geforce FX 5200 Airport Express card Pioneer DVR 106D (defective burner) USB 2.0 PCI card 5 port I paid $600 for it, so it seemed like a good deal at the time. Should I just go through the machine and grease all the fans? Will that solve my problems?