No. Sounds frightening. Have you checked the power supply cable to make sure its connections are tight? Might be the power supply itself. No real idea, though. Have you gone to Apple's support center? There are technical articles and user comments available that may help. Let us know when you've traced the problem, please. And good luck. jon Original Message: ----------------- From: Tore wifido at wanadoo.es Date: Tue, 4 Dec 2007 12:19:05 +0100 To: g4 at listserver.themacintoshguy.com Subject: [G4] Sawtooth sudden power failure! Has anyone experienced this phenomenon, there is no apparent reason and I can restart immediately. I'm on a UPS so there is no general PF and the screen has power from the G4 the whole time. The machine just switches off, no shut down, no warnig, just zapp! _______________________________________________ G4 mailing list G4 at listserver.themacintoshguy.com http://listserver.themacintoshguy.com/mailman/listinfo/g4 -------------------------------------------------------------------- mail2web.com Enhanced email for the mobile individual based on Microsoft® Exchange - http://link.mail2web.com/Personal/EnhancedEmail