On Tuesday, December 3, 2002, at 12:31 PM, silvoc at tiscali.it wrote: > Dear All, > > My Tibook500 has started not to go automatucally to sleep. It started > in > august, episodically, when I was using OS10.1.5, and I corrected it > deleting > the systempreferences.plist in my library folder. ..... > > Can somebody help me? did you try zapping the PRAM? command-option P R at startup all 4 at the same time. Wait till you hear two chimes and the let it startup - you may have to restart. frank farwell