thanks to all who responded. i put in a new ps by antec (dual fans) and voila ! problem solved, also, very quiet !!! so maybe this will keep the old P3 550mhz going another 5 years with few and brief off periods for cleaning. -- betty i. www.WebCanine.com research & information for people who care for dogs --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us To subscribe, unsubscribe, or to change you mail settings: http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss