Mac Mini spontaneously log outs

New machine.
Hooked up to LaCie Thunderbolt external drive on which resides the iTunes library.
Ethernet connection to Time Capsule basestation.
Apple TV3 also connected by ethernet to Time Capsule basestation.
Mac Mini set up to auto log in on start up. Sleeps after 10 mins. Screensaver set to never.Security > General: "require password after sleep" is UNcheked.
Still the Mini seems to be logged out when awaking from sleep and the iTunes library is unavailable to the Apple TV3.
What is wrong?

From the menu bar, select
 ▹ System Preferences... ▹ Security & Privacy ▹ Advanced... ▹ Log out after … minutes of inactivity: Off
If there's a closed padlock icon in the lower left corner of the preference pane, you may need to click it to unlock the settings. Enter your login password when prompted.

Similar Messages

Will this cable work for connecting the Mac Mini's optical out to my audio system?

Mac Mini's optical out to my audio system's Toslink optical in using this cable?
http://www.bhphotovideo.com/c/product/297015-REG/Hosa_Technology_OPQ_210_Toslink _Male_to_Mini_Toslink.html
Or must I use an adapter/Toslink cable combination?
http://www.bhphotovideo.com/c/product/516240-REG/Hosa_Technology_GOP_490_TOSlink _Optical_Female_to.html + Toslink cable
If both works, which one is better in your opinion?

The cable in the 1st link should work fine. (Toslink to Mini-Toslink)

Spontaneous Log Out

This has happened twice over the past two weeks - I'll be working away on my MacBook Pro when things will slow down and my computer spontaneously logs out. No major problems come from this other than apps being shut down improperly. I'm a frequent saver, so I haven't had any major data loss (yet).
This just generally makes me nervous - anyone have thoughts on this?

Thanks for the response. Turns out Filemaker Pro 8 was at the heart of my issue and I found a solution here:
http://discussions.apple.com/thread.jspa?threadID=2136412&start=90&tstart=0

My mac mini keeps logging me out after no activity.

the option to check/uncheck, "log out after X mins of no activity" is not an option to select.
when it forces a logout, the screen saver is showing, not moving, and when you move the cursor, it acts like an eraser and removes the part of the screen savor picture revealing the login screen underneath. of course this starts happening when my warranty period is over.
can anyone help? i've looked all over the net for this issue.
thanks.

I had already done that for the screen saver a few weeks ago. Unfortunately, since I'm new to mac I can't do a screen shot, but several users had recommended going to Apple > System Preferences > Security & Privicy > General and uncheck the box " Logout after [______] minutes of inactivity." There was a screen shot in one conversation I had and it showed 5 options under this specific tab, including the auto logout option. My mac only has 4 options and does not include the logout option in this area. So I started looking around under every single app under System Preferences and when I opened Security & Privacy, on the bottom right corner is a button for Advanced. I opened that and the option for Auto logout is there. I unchecked it. So we'll see if this solves the issue.
Thanks for all the input. I appreciate it.

Spontaneously Logging Out?

Anyone else seeing this?
My MacBook Pro is occasionally bailing out of the active user session.
I usually detect this by returning to the idle machine and finding it at the login window, with whatever account happened to be active (I usually have two accounts running) logged out. I have once seen it happen out of the corner of my eye: the screen abruptly switches to the login window. I generally don't leave any documents unsaved, but I have to assume that any such work would be lost if I left it that way.
There are no CrashReporter logs in my console. system.log seems to show the following message around the time of some of the events (but not all):
Mar 15 17:27:20 Dougs-MacBook-Pro kernel[0]: (94: coreservicesd)tfp: failed on 0:
Mar 15 17:27:23 Dougs-MacBook-Pro /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
I did a Disk Repair and Repair Permissions last night, and it's still happening.
Any ideas?
TIA,
Doug K;
MacBook Pro, 1.83 GHz Mac OS X (10.4.5) 1 Gig of RAMon one DIMM (BTO option)

My MacBook just logged me out, spontaneously, on wake from sleep. My "Log out after xxx minutes of inactivity" option was not checked.
Apr 6 23:50:53 Powerbook-2 kernel[0]: hibernatewriteimage done(0)
Apr 6 23:50:53 Powerbook-2 kernel[0]: sleep
Apr 6 23:50:53 Powerbook-2 kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Apr 6 23:50:53 Powerbook-2 kernel[0]: Started CPU 01
Apr 6 23:50:53 Powerbook-2 kernel[0]: System Wake
Apr 6 23:50:54 Powerbook-2 kernel[0]: USB caused wake event (EHCI)
Apr 6 23:50:55 Powerbook-2 mDNSResponder: mDNSPlatformRawTime went backwards by 191 ticks; setting correction factor to 1386845432
Apr 6 23:50:56 Powerbook-2 lookupd[518]: lookupd (version 369.5) starting - Thu Apr 6 23:50:56 2006
Apr 6 23:50:56 Powerbook-2 crashdump[517]: WindowServer crashed
Apr 6 23:50:56 Powerbook-2 configd[37]: rtmsg: error writing to routing socket
Apr 6 23:50:56 Powerbook-2 loginwindow[136]: LWScreenLock: reactivate hotkeys, cgerror = -308
Apr 6 23:50:56 Powerbook-2 /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Error: owner of process not logged in on console - exiting.
Apr 6 23:50:56 Powerbook-2 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Apr 6 23:50:58 Powerbook-2 crashdump[517]: crash report written to: /Library/Logs/CrashReporter/WindowServer.crash.log
Apr 6 23:50:58 Powerbook-2 /Library/StartupItems/iScroll2/iScroll2Daemon: No console user currently logged in.\n
Apr 6 23:50:59 Powerbook-2 /Library/StartupItems/iScroll2/iScroll2Daemon: Default settings found; 20 settings loaded.\n
Apr 6 23:50:59 Powerbook-2 loginwindow[520]: Login Window Started Security Agent
Apr 6 23:50:59 Powerbook-2 kernel[0]: (63: coreservicesd)tfp: failed on 0:
MBP 2.0, G5 2x2.0, Cube, Mini (2), Intel Mini Mac OS X (10.4.6)

Mac mini 2014 mDP out of range

Hi,
I have a strange issue with Mac mini late 2014 and NEC PA272W monitor. Mac mini and the monitor are connected by high quality mini display port cable.
Sometimes on boot the display is reporting: Out of range message H 14,6KHz. Its a sync problem?
Then I have to turn off and on the monitor to restore image.
Any advice to this?

Sadly, this "out of range" problem has re-appeared today :-/
This is log from the console:
08.02.2015 13:36:44,486 WindowServer[121] Received display connect changed for display 0x28da5200
08.02.2015 13:36:44,486 WindowServer[121] Found 1 modes for display 0x28da5200 [1, 0]
08.02.2015 13:36:44,486 WindowServer[121] Display 0x28da5200 changed state to offline
08.02.2015 13:36:44,490 WindowServer[121] No display devices are on-line. Switching to virtual display mode
08.02.2015 13:36:44,493 WindowServer[121] Received display connect changed for display 0x3f003d
08.02.2015 13:36:44,493 WindowServer[121] Found 1 modes for display 0x003f003d [1, 0]
08.02.2015 13:36:44,503 WindowServer[121] Display 0x41dc9d00: GL mask 0x1; bounds (0, 0)[2560 x 1440], 35 modes available
Main, Active, on-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 0, Rotation 0
UUID 0x3cd5b411aa96bcb56a310d5b3ba2be96, ColorSpace { 847203028 }
08.02.2015 13:36:44,503 WindowServer[121] Display 0x41dc9d02: GL mask 0x4; bounds (3584, 0)[1 x 1], 2 modes available
off-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:44,503 WindowServer[121] Display 0x41dc9d01: GL mask 0x2; bounds (3585, 0)[1 x 1], 2 modes available
off-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:44,506 WindowServer[121] CGXDisplaysDidReconfigure: Display added
08.02.2015 13:36:44,506 WindowServer[121] CGXDisplaysDidReconfigure: Display removed
08.02.2015 13:36:44,507 WindowServer[121] Display 0x41dc9d00: GL mask 0x1; bounds (0, 0)[2560 x 1440], 35 modes available
Main, Active, on-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 0, Rotation 0
UUID 0x3cd5b411aa96bcb56a310d5b3ba2be96, ColorSpace { 847203028 }
08.02.2015 13:36:44,507 WindowServer[121] Display 0x41dc9d02: GL mask 0x4; bounds (3584, 0)[1 x 1], 2 modes available
off-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:44,507 WindowServer[121] Display 0x41dc9d01: GL mask 0x2; bounds (3585, 0)[1 x 1], 2 modes available
off-line, enabled, built-in, Vendor 756e6b6e, Model 76697274, S/N 0, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:44,521 com.apple.AmbientDisplayAgent[169] AMBD: copyVCGTtoLUTtable() synth'ing linear LUT
08.02.2015 13:36:46,507 WindowServer[121] **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
08.02.2015 13:36:46,518 DMProxy[373] CGSCopyDisplayInfoDictionary: error requesting display info dictionary (0x3e8)
08.02.2015 13:36:46,523 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x41dc9d00: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 3)
08.02.2015 13:36:46,526 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:46,539 DMProxy[373] AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
08.02.2015 13:36:46,543 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x41dc9d00: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 3)
08.02.2015 13:36:46,547 com.apple.AmbientDisplayAgent[169] AmbientDisplayAgent started
08.02.2015 13:36:46,550 com.apple.AmbientDisplayAgent[169] AMBD initializing devices
08.02.2015 13:36:46,554 com.apple.AmbientDisplayAgent[169] AMBD: copyVCGTtoLUTtable() synth'ing linear LUT
08.02.2015 13:36:46,555 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:47,000 kernel[0] EDID CEA Extensions not valid for audio [Revision ID]: 1 (minimum value: 3)
08.02.2015 13:36:48,212 WindowServer[121] Received display connect changed for display 0x3f003c
08.02.2015 13:36:48,213 WindowServer[121] Found 43 modes for display 0x003f003c [43, 0]
08.02.2015 13:36:48,213 WindowServer[121] Display 0x003f003c changed state to online
08.02.2015 13:36:48,239 WindowServer[121] New display device coming on-line. Switching from virtual display mode
08.02.2015 13:36:48,240 WindowServer[121] Received display connect changed for display 0x3f003d
08.02.2015 13:36:48,240 WindowServer[121] Found 1 modes for display 0x003f003d [1, 0]
08.02.2015 13:36:48,252 WindowServer[121] Display 0x003f003e: GL mask 0x4; bounds (3584, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:48,252 WindowServer[121] GLCompositor: GL renderer id 0x01024501, GL mask 0x00000007, accelerator 0x00002447, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
08.02.2015 13:36:48,252 WindowServer[121] Display 0x003f003d: GL mask 0x2; bounds (3585, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:48,252 WindowServer[121] Display 0x28da5200: GL mask 0x1; bounds (0, 0)[2560 x 1440], 43 modes available
Main, Active, on-line, enabled, boot, OpenGL-accel, Vendor 38a3, Model 6948, S/N 0, Unit 0, Rotation 0
UUID 0x3cd5b411aa96bcb56a310d5b3ba2be96, ColorSpace { 847203028 }
08.02.2015 13:36:48,252 WindowServer[121] GLCompositor: GL renderer id 0x01024501, GL mask 0x00000007, accelerator 0x00002447, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
08.02.2015 13:36:48,262 WindowServer[121] Display 0x28da5200: Unit 0: Startup Mode 2560 x 1440, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80001000, ioModeDepth 0x0, IOReturn 0x0
08.02.2015 13:36:48,262 WindowServer[121] CGXDisplaysDidReconfigure: Display added
08.02.2015 13:36:48,262 WindowServer[121] CGXDisplaysDidReconfigure: Display removed
08.02.2015 13:36:48,263 WindowServer[121] Display 0x28da5200: GL mask 0x1; bounds (0, 0)[2560 x 1440], 43 modes available
Main, Active, on-line, enabled, boot, OpenGL-accel, Vendor 38a3, Model 6948, S/N 0, Unit 0, Rotation 0
UUID 0x3cd5b411aa96bcb56a310d5b3ba2be96, ColorSpace { 847203028 }
08.02.2015 13:36:48,263 WindowServer[121] GLCompositor: GL renderer id 0x01024501, GL mask 0x00000007, accelerator 0x00002447, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
08.02.2015 13:36:48,263 WindowServer[121] Display 0x003f003e: GL mask 0x4; bounds (3584, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:48,264 WindowServer[121] GLCompositor: GL renderer id 0x01024501, GL mask 0x00000007, accelerator 0x00002447, unit 0, caps QEX|MIPMAP, vram 1536 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
08.02.2015 13:36:48,264 WindowServer[121] Display 0x003f003d: GL mask 0x2; bounds (3585, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
08.02.2015 13:36:48,273 WindowServer[121] MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x28da5200 device: 0x7fa849516e60 isBackBuffered: 1 numComp: 3 numDisp: 3
08.02.2015 13:36:50,241 WindowServer[121] **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
08.02.2015 13:36:50,263 WindowServer[121] **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
08.02.2015 13:36:50,267 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x28da5200: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 12)
08.02.2015 13:36:50,270 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:50,301 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x28da5200: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 12)
08.02.2015 13:36:50,304 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:50,312 DMProxy[374] AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
08.02.2015 13:36:50,319 com.apple.AmbientDisplayAgent[169] AmbientDisplayAgent started
08.02.2015 13:36:50,334 com.apple.AmbientDisplayAgent[169] AMBD initializing devices
08.02.2015 13:36:50,334 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x28da5200: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 12)
08.02.2015 13:36:50,340 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:50,346 DMProxy[375] AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
08.02.2015 13:36:50,350 WindowServer[121] CGXSetDisplayColorProfileAndTransfer: Display 0x28da5200: Unit 0; ColorProfile { 847203028 }; TransferTable (256, 12)
08.02.2015 13:36:50,355 com.apple.AmbientDisplayAgent[169] AmbientDisplayAgent started
08.02.2015 13:36:50,359 com.apple.AmbientDisplayAgent[169] AMBD initializing devices
08.02.2015 13:36:50,365 com.apple.AmbientDisplayAgent[169] AMBD Agent: xpc connection became invalid during event handler
08.02.2015 13:36:51,808 Console[376] Failed to connect (_consoleX) outlet from (NSApplication) to (ConsoleX): missing setter or instance variable

Mac-Mini HTPC Video-Out Problems (Component to DVI)

I recently decided to go with a Mac-Mini as the central-brain of my HTPC configuration, and I was immediately halted in the process of getting things working by my inability to properly output video from the Mac-Mini such that it's even visible on my 50" Plasma TV (Panasonic TH-50PHW3).
Neither of my A/V Receivers (Denon AVR-3805 & Denon AVR-2805) have HDMI inputs, but both of them have component video inputs for HD content, so I purchased the DVI-to-Component cable linked below to use for outputting video from my Mac-Mini to the Denon:
http://sewelldirect.com/DVI-to-Component-Adapter-Cable-6ft.asp
Needless to say, nothing I've tried has been effective in my Mac-Mini being displayed on my Plasma TV??
Any thoughts?

From other threads I see that others have tried and failed at this. The adapter cables don't work with the Mini (or other Macs as far as I know). Apparently you need a "transcoder" box. It will apparently take the DVI port's RGB signals and convert them to Y-Pb-Pr component signals.
The transcoders can also cost a couple hundred bucs. Check out some of the discussions at http://www.avsforum.com/avs-vb/showthread.php?t=824143
Here is a relatively cheap one that seems to work: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=63079 2&CatId=1430
Other option is to go with a S-Video adapter http://store.apple.com/us/product/M9267G/A but you will loose resolution.l
Message was edited by: Saul in PA

HT4806 Mac mini digital audio out through the headphone jack

I'm misled by this sentence for audio out port from the support page: "For digital audio, you can use Apple iPhone headset with microphone".
http://support.apple.com/kb/ht5539
It is there for all mac minis starting from 2010 model.
Does it mean electrical digital signal? Any chance to get S/PDIF coaxial signal?

If an optical signal is OK, you just need one of these:
http://www.amazon.com/dp/B00016W6Y6
To convert the optical signal to a co-ax one will need a more complex/expensive convertor.

No sound from tv speakers connected to mac mini (toslink/digital out)

Hi there,
I followed this guide: http://www.tuaw.com/2009/08/21/ultimate-mac-mini-htpc-guide-hardware/ and bought a toslink to get audio from the mac mini to the tv speakers (sony bravia kdl40v5100). However, I can't hear any audio coming out from the tv speakers. What's up?
On a side note, I got the mac mini display connected with hdmi to my tv, which works well.
Let me know, thanks.
Message was edited by: sputskee

According to the specs of your display, the kdl40v5100 does not allow you to make a digital audio connection between your mini and the TV, and therefore you can not use the TOSLINK cable you purchased to do this..
However, you can make an analog connection. At the back of your TV, you will notice that one of your HDMI inputs has 2 plugs next to it- a red one and a white one.
Here is a picture of the back of your set. Look at number 5. This is where you will make the connection.
http://www.retrevo.com/r/23482dj787/9/LocatingInputs+and+Outputs#q=SonyKDL-40V5100
This is where you will connect the mini audio, by using a cable that looks like this...
http://lookpic.com/i/683/k6wVcFwQ.jpeg
(and of course, if the HDMI for the mini is not plugged into the neighboring HDMI port you will have to switch things around to do so.
Message was edited by: kguy

My Mac will not "log out". what do I need to do

My Mac will not allow me to "log out". What should I do?

Greetings,
What happens when you attempt to go to Apple Menu > Log out?
Assuming you are running Mac OS X 10.6.7:
Backup your data: http://support.apple.com/kb/HT1553
SafeBoot your computer: http://support.apple.com/kb/HT1455
Login to your normal Admin account while in SafeBoot
Download and install the 10.6.7 combo while in SafeBoot: http://support.apple.com/kb/DL1361
Restart the computer as normal and then see if you can logout.
Hope that helps.

Why does my Mac Air keeps logging out and restarting

Can you explain to me why my Mac Air keeps giving me this message? In the middle of a download and I get this when the computer goes into sleep. Once I get this message it will keep trying to log out until finally I log out and then back in again.

From the menu bar, select
 ▹ System Preferences... ▹ Security & Privacy
If there's a closed padlock icon in the lower left corner of the preference pane, click it and enter your login password when prompted.
Click the Advanced button and, in the sheet that opens, uncheck the box marked
Log out after … minutes of inactivity

Mac Mini Monitor Blacking out

Hey guys,
I have a 1.4ghz G4 Mac Mini and i recently purchased a samsung 205bw lcd display. I am running on the native resolution of 1680x1050 60hz refresh rate (the recommended settings for the monitor)
Overall, the monitor works great until i try to watch video fullscreen. For some reason in VLC or Quicktime, after a while the screen begins to flicker than turns black. I ran every diagnostic that samsung has and there is apparently nothing physically wrong with the monitor. I was wondering. I downloaded SwitchResX but i wasnt sure which settings to change if anyone had any ideas..
thanx in advance

Got a Samsung SyncMaster 204B and having problems with a Belkin DVI/USB KVM switch. When switching form PC (WinXP) to mac mini I often get this blackout/flickering you all mentioned
Apple has to do something about that.
mac mini (PPC) Mac OS X (10.4.8)

Mac Mini Extremely Slow out of the box

So I just got a brand new Mac Mini yesterday. It is the 4GB with the 1TB 5400 rpm HDD... It takes 15+ seconds to open system pref sometimes. Mail is empty and I can see 5-6 bounces before it opens.
My 2010 iMac dual core is faster than this, email opens instantly and I may have 3000+ emails.
I did a SMC reset, and I want to make sure I have a good grasp on this before I call it in to AppleCare. Is a 5400rpm HDD really this slow? Activity monitor shows nothing wrong, but then again there isn't anything installed on here. I don't have a problem if I need to upgrade the RAM but don't want to bandaid anything if I can fix it instead
Any suggestions before I call this in would be appreciated.

It shouldn't be that slow, unless maybe Spotlight is Indexing, TimeMachine is doing a full backup or another Process is using alot of CPU.
Go to the Activity Monitor, select All Processes, click on the %CPU tab and check to see if you have a Process that has Failed or is using a high % of CPU.

Spontaneous logging out

Three times today when working with Filemaker, my computer screen went blue and I had to log back in. I used the install CD and did a disk repair, tried to do a permission repair and got "no valid Packages". Fired the computer, Mac Pro using OS vs. 10.5.2, did a permissions repair and then a few minutes later, using Filemaker 8, logged me out again. What now?

I had this problem for perhaps the third time in recent memory just moments ago. It's happened both when I used a keyboard shortcut to app switch (Command-Tab) and select-all (Command-A), in separate instances. FileMaker is not installed.
I just trashed the loginwindow.plist file so we'll see if it happens again.
Stupid Leopard tricks! And there seem to be several of them...

Mac not restarting, logging out, or shutting down?

My mac that I got back in August is no longer restarting, shutting down, or logging off. The only thing I can do is hold down the power button. This becomes a problem when I get software updates that require restarting. Help?

Aly,
http://support.apple.com/kb/HT1411?viewlocale=en_US
More or less it says:
The System Management Controller is an integrated circuit (computer chip) that is on the logic board of the computer. As the name implies, it is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.
To reset:
MacBook, MacBook Pro except MacBook Pro (17-inch, Early 2009)
1. If the computer is on, turn it off.
2. Disconnect the AC adapter and remove the computer's battery.
3. Press and hold the power button for 5 seconds and then release the button.
4. Reconnect the battery and AC Adapter.
5. Press the power button to restart the computer
Note: Starting with MacBook Pro (Late 2008) and MacBook (Late 2008) models, you may instead use the reset method for MacBook Air (below) to reset the SMC. All earlier models of MacBook and MacBook Pro must use the method described above, which involves removing the battery.
MacBook Air (Original), MacBook Air (Late 2008) and MacBook Pro (17-inch, Early 2009)
1. If the computer is on, turn it off by choosing Shutdown from the Apple () menu.
2. Connect the power adapter to a working power source.
3. On the built-in keyboard, press (left) Shift-Control-Option along with the power button once.
4. Wait 5 seconds and press the power button to start the computer.
Note: You must use the keys on the left side of the built-in keyboard.
You should only perform an SMC reset when the MacBook Air or MacBook Pro (17-inch, Early 2009) has been properly shutdown. This prevents issues from occurring to the file system.
While the power adapter does not need to be connected to reset the SMC, it may be necessary in situations where the battery needs charging or if the computer has been without power for an extended period of time.
Let us know if a reset helps.
Bob

Mac Mini spontaneously log outs

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