I don't know if this is the right forum if not can someone please direct, I have an issue with my Mac My spec is 2.3GHz Power PC G5 Mac OSX Vers 10.4.11. 4.5 GB RAM Over the weekend I got back from a weeks holiday and powered up my Mac. On three occasions yesterday while it was left alone or in sleep mode the fans went very loud and the screen would not come back up. The only way to stop the fans was to hold in the start button for several seconds until it powered down and restart it up again. At one point on restart it did say I needed to restart as max os x had quit unexpectedly. I am trying again today and working on it so far seems ok, it seems that if I leave it for a while the above will happen. Any suggestions?