Check www.xlr8yourmac.com. They had recent articles on these PowerLogix processors and their voltage. Increasing the voltage made the whole machine more stable. Eric On Apr 6, 2007, at 6:14 PM, g4-request at listserver.themacintoshguy.com wrote: >>> Im using a Mac G4 with 1.75Gb of Ram (all 2-2-2 speed). I have >>> rebooted, zapped the p-ram, and used applejack. Nothing seems to >>> cure >>> the problem. Im using a "Powerlogix" upgrade 1.6Ghz processor >>> (OSX.4.9). Anyone got a clue as to what this problem is and how it >>> might be cured? Thanks. >>> >>> Tom