Hello NAG, Thanks to everyone for your input. I have contacted Dell support and they have agreed to replace the motherboard. I just hope this is a permanent fix? But, Dr. Carter's comments about continuing problems aren't very reassuring. (We are currently in the process of ordering a new XPS 17" system right now??) Thanks again Cliff -- Clifford L. Beckett office: 517-355-4659 Electronic System Designer cell: 517-449-8226 A411 E. Fee fax: 517-353-0789 OMM Department email: [log in to unmask] Michigan State University web: www.obl.msu.edu East Lansing MI, 48824