Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_3 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7E18 Safari/528.16) Hi, my G5 is playing up, the first time it's happened since I've had it. Working normaly and it just froze and the fans came on and it sounded like it was gonna take off. I had to power down by holding the power button. After ten mins I started it back up an it was fine for half hour then the fans went crazy again and it froze so I powered down and left it until the morning. This time after turning on it was just a black screen and after 5 mins the fans kicked in and went crazy. I looked on some forums on a laptop and done a few suggestions, like Single mode which it modified something and I repeated the process and all was ok. Still no boot tho. I tried reset-nvram set-defaults reset-all and it worked and I was able to enter my password and carry on as normal, I was really happy!!! Then an hour or two later a screen popped up saying I had to restart it. So i did and now it just sits at the apple screen and after five mins the fans go Crazy. Not sure what else to do. I don't have hardware test CDs so can't check that. I hear the chime on boot up and then just hangs at the apple screen. ??? I've reseated the ram and the video card and now I don't have a clue. HELP Please. I'm pulling my hair out. Thanks in advance.