Anyone have a clue as to what would cause my one piece iMac G5 with 10.4.5 to suddenly click and shut off at random times. Could be during launch or 10 hours later or even when not being used. Does the same when booted from the Tiger DVD. Otherwise it runs perfectly. Regards, Winston MacKelvie The Winston Works Inc. http://www.inventure.ca 1-450-243-6850