I´m not sure I have totally solved the problem, I suspect that, although it's still keeping time, it´s about time to change the battery (lithium 3,6V 1,1 AH) on the motherboard. What I did was a search and found these sites, one after the other http://tinyurl.com/y94b2p http://docs.info.apple.com/article.html?artnum=300574 http://docs.info.apple.com/article.html?artnum=95035 After having read them I reset the PMU and it´s now s back in working order for the time being, Thanks for the response. > Message: 1 > Date: Tue, 4 Dec 2007 06:48:59 -0500 > From: "jonseward at mindspring.com" <jonseward at mindspring.com> > Subject: RE: [G4] Sawtooth sudden power failure! > To: g4 at listserver.themacintoshguy.com > Message-ID: <380-220071224114859126 at M2W017.mail2web.com> > Content-Type: text/plain; charset=iso-8859-1 > > > Let us know when you've traced the problem, please. And good luck. > > > jon > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://listserver.themacintoshguy.com/pipermail/g4/attachments/20071207/743984cf/attachment.html