So my iMac G5 died, hence my recent silence. It just started randomly shutting down, sometimes 20 minutes after I started it, sometimes before I even hit the grey screen. After trying the internal power button, resetting the SMU and the PRAM and anything else I and Apple could think of we determined that I need a new power supply. The bad news is that it looks like I am not alone in my experience. The good news is that my iMac did not melt and that the new power supply should be here by Monday. In the mean time I have to schedule extra time at work so I can do my homework.