Have you checked for the blaster worm? Just a possibility, and an experience I have just been through. Mine was more frequent than hourly though, so, hopefully it is something less significant. Rick H DavisUnit wrote: >I'm working on a PIII-550 machine that has randomly been shutting >down/restarting - sometimes within an hour, somtimes within 3 hours or >more. > > To unsub or change your email settings: //www.freelists.org/webpage/pctechtalk To access our Archives: http://groups.yahoo.com/group/PCTechTalk/messages/ //www.freelists.org/archives/pctechtalk/ For more info: //www.freelists.org/cgi-bin/list?list_id=pctechtalk