My Mac keeps shutting down on its own after being started for several minutes. Does anyone know why this happens (EI Captain)
iMac (27-inch Late 2009), OS X El Capitan (10.11)
It may be / or think it's overheating and it trying to protect itself.
One the iMacs at work did this after we replaced the HD and the new one didn't have temperature sensor on it. We needed to download a software solution to get around it.
Startup – Computer restarts by itself – Yosemite
Try a SMC reset. The article covers when this is required, but doing this will not affect anything.
Thanks Eric tried your fix unfortunately it did not solve my problem. But what I noticed now is it is actually just the screen going blank and the Mac is still running. Maybe a light issue
It sounds like you have the Display set to turn off.
System Preferences > Energy Saver. Change the slider to something more appropriate.
About Energy Saver sleep and idle modes in Mac OS X - Apple Support
OS X: Saving energy with Sleep - Apple Support
Can you please give a feedback, if one of the articles work?
What you can try otherwise is to create another Admin Account called test with the password test to see if you have the issue with this new account as well. This will help you to clarify if there is an issue with your user account or if there is an issue with OS X or the hardware of your Mac.
My Mac Desk top keeps shutting down on its own anyone know what the cause may be??
