ML shuts down or restarts machine on its own!?!

[Kashchei]

I did a clean install of ML and it works well, with one exception. If I leave my machine and return after a time, it will have either shut down or restarted. I reset the energy saving setting to never sleep hard drive and this has not made a difference. Does anyone have any idea what the problem might be?

 

[mrapplegate]

I did a clean install of ML and it works well, with one exception. If I leave my machine and return after a time, it will have either shut down or restarted. I reset the energy saving setting to never sleep hard drive and this has not made a difference. Does anyone have any idea what the problem might be?

No idea, but my first troubleshooting step is always check the logs. The system log might give a reason.

 

[cambookpro]

It could be that it had kernel panicked and restarted automatically. I had that with Lion for a while. Open up Console and check the logs.

 

[Branskins]

ML has a new default kernel panic flow.

Before if you had a kernel panic, the screen would go gray, tell you what happened, and then make you press the power button.

Now the computer shuts down, restarts, displays the gray screen, but it automatically continues restarting after like 10 seconds or after you press a key.

Basically user involvement is no longer necessary. Check the crash reporter logs to see if you had a kernel panic. Most of the time, OS X should present you with a dialogue box asking you to send the report to Apple, indicating that you had a kernel panic