Question: 2011 desktop
My Imac desktop has been shutting off. I have had it off for example 8 hours and the minute I turn it on for about 30seconds it shuts it's self off and I have to restate it again at least twice more. What is wrong. P.S. It can't be the fan because a new one was installed last year.
iMac, OS X Mavericks (10.9.5)