that shuts down due to temperature. Can't judge that by feeling the exhaust air.
Open the case and clean the fans etc, make certain that they are running at full speed.
Recently developed a problem in my standby computer. It has turned itself off 2 or 3 times in the past month. Only one of these events occured in my presence, (the others were when the machine was idle). There was no warning message or anything. One minute, I was composing an email message and the next, POOF! There may have been a slight "click" sound and the machine was dead -- completely powered down! Any ideas or suggestions? This is a 4 year old Gateway. Pentium III (450MHZ), 30GB WD HDD, 384MB memory, Win 98SE. Only thing that I could think of was possibility of overheat somewhere. But the air exiting the case has always been quite cool. I'm open to suggestions. Thanks, guys!