HELP! My iMac G5 RevB (full spec in signature) just cut out, i thought it was a power cut at first but its not now it wont start, it gets half way though the chime and cuts out completely. I've tried resetting the SMU and no change i cant reset the PRAM because it cant even make a whole chime now. Ive had a look inside, no weird smells or nothing other noticably wrong, no new ram has been added (Still the stock 512mb) also no apple care and the closest apple store is the london one. so i dont want to have to take it there and spend a fortune on a new psu or something until i know whats wrong. Any ideas????? anyone? i'm stuck on my G3 Clamshell now ARRRGGGHHHH!!!!