Macintosh OS/involuntary logout

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Question
QUESTION: I run FIREFOX 38.0.5 ON OS X YOSEMITE 10.10.4

Browser is downloading a file. I leave for an hour, return to
the computer, a message pon screen reads
FIREFOX prevented the computer from logging out.

In otherwords, this mac mini now tries to log out and shut down,
of it's own accord. If the browser is not downloading a file, I return to find the browser has shut down,and themac mini has shut down.How can the computer shut itself off ?
It is just craziness.

ANSWER: > Browser is downloading a file. I leave for an hour.

Something is set to log you out of your system after a period of time.

Firefox was running, downloading a file and prevented the logout.

> In otherwords, this mac mini now tries to log out and shut down,
of it's own accord.

No, there's a setting somewhere that needs to be turned off.

Let's try this:

System preferences> Energy Saver.

See if the "Schedule Button" is set to schedule your computer to logout.

---------- FOLLOW-UP ----------

disk  report
disk report  
QUESTION: Jeff
Continuing this topic, I followed your suggestion.
My ENERGY SAVER settings are :
computer sleep = never
display sleep  = 15 minutes
SCHEDULE
start or wake up =   unchecked
Sleep          =   unchecked
-------------------------------------------
I ran disk utility. It reports the
hard drive is good, with one exception.
A system file has been modified and will not be repaired.
I attach a snapshot of this report.
I have seen this exact report for approximately 6 weeks now.
My computer glich is about 10 days old.
Maybe these 2 things are not related...........?

ANSWER: James,

I never saw the snapshot of the report, but I don't think it's a factor here.

I want to restate the problem:

When your system is left idle (doing nothing), the screen goes to sleep ...and then after an hour it logs out.

Is this correct?


---------- FOLLOW-UP ----------

ENERGY SAVER WINDOW
ENERGY SAVER WINDOW  

SCHEDULE WINDOW
SCHEDULE WINDOW  
QUESTION: Jeff.
The answer to your question is YES.

The the amount of time varies, one hr approximates.
If I am downloading something, via TRANSMISSION  os x app,
the logout is prevented becaise Transmission wouldn't cooperate,
BUT NOT EVERY TIME :
Sometimes, TRANSMISSION has turned off and cooperated with the
log out process !
This is totally crazy.
The symptoms can be listed this way :
Computer shuts down, of it's own volition,
The download app prevents this shutdown, sometimes, sometimes not;

The energy saver is set at NEVER SHUT DOWN DISCS
The items in the SCHEDULE window are all unchecked, therefore, they
should affect nothing.

Answer
James,

I know it feels frustrating. But it's not of it's own volition. Something is triggering a shutdown.

All we have to do is figure what app/reason it's being caused. It's hard to say without looking directly at the machine.

Next time it does this (can your force it?), I'd like to see what the Console reports.

After the next shut down, start your computer back up

Utilities> Console.app

Then, I'd like you to search for "kernel", and "shutdown".

Kernel is the heart of the OS. It should report the startup/shutdown times.

Shutdown may (or may not) be invoked as a low level command.

Once we find WHEN it happened, then we look in the console (clear out the filter) and see what events happened right BEFORE the shutdown event.

Let's see where this takes us.

Macintosh OS

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Jeff Greenberg

Expertise

I can comfortably answer most basic/advanced questions regarding Macintosh hardware and software - nowadays only OSX. In fact, if it's prior to 10.3, there's a good chance I'll reject your question. Forget OS9 stuff - Igave up OS 9 ten years ago). Please do not ask me about OS9. My particular specialties are in Video editing/DVD authoring. I am a certified trainer in the "pro apps" (Final Cut, DVDSP, Soundtrack, Motion). I have been using Macs since 1985.

Experience

I'm an Apple Cert. Trainer for FCP, DVD SP, since the inception of this program. I've was
certified as an Apple Cert. Technician back in 1989.

Publications
Videography, Macworld, Tibits

Education/Credentials
BA film- Penn State. Certifications from Apple, Adobe and Avid for training.

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