Last month my 1.8 GHz G5 tower stopped working. I tried turning it on and nothing happens. The light on the power button doesn't come on so I'm thinking it might be the power supply. I have a Mac Mini and inserted the G5's main(160 Gb) hard drive into an external case to check the content, however the hard drive isn't detected. Could the reason the G5 tower doesn't power up be that the system's (main) hard drive failed? Would this cause no power at all?