IMac Enters Sleep mode during video playback

My imac started behaving badly a few weeks ago. It seems that at times of video play back, itunes, youtube, vlc, that my iMac just says nope and goes to sleep. I have tried resetting the ram during start up and it took care of the issue for all of an hour. I am at my wits end here please somebody give me a solution.

The times that your machine goes to sleep are times when you are maxing out the RAM. However, try looking in your Console>system log for any references to exceeding the maximum temperature for more than 30 seconds; that would indicate a thermal problem, probably the power supply unit failing.

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IMac enters sleep mode while playing Blizzard games

About every 20 seconds my iMac enters sleep mode while playing Blizzrard games. When I click the mouse or touch a key on the keyboard the iMac wakes up and the game is still running. This has been happening more frequently over the past six weeks. Now it occurs every twenty seconds. I have turned off my sleep mode settings, reset the SMC, loaded the TechTool Deluxe and ran a diagnostic. When TechTool Deluxe came to testing the video ram the utility crashed. I ran TechTool Deluxe a second time and it crashed again while testing the video ram. My iMac only has this problem playing Blizzard games. I have contacted Blizzard and they don't have an answer. Is it my video card? I have the NVIDIA GeForce GT 130 512 MB graphics card. Any help would be appreciated.

Likely is the Video card, but...
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/

IMac beeps once before entering sleep mode

My iMac 24 inch has started to beep once before entereing sleep mode. The LED thinks blinks whilst it is asleep, which I assume is normal. Is this indicative of a hardware fault? I understand that a single beep on startup indicates a ram problem.

If you listen carefully, you may find this beep is
coming from the hard drive, not the speakers (plug
headphones in and find out if it still makes the
beep).
Some hard drives make this beep if they have a
re-positioned write, which is a non-fatal error. You
can usually reformat to re-allocate the block and
stop the error, or you can live with it.//
Hi
Yes you're correct, it doesn't come from speakers. It not makes the same faint beep (rather like a heart monitor blip) when closing down and always after the screen has gone blank. I have noticed that if you put a CD-ROM in the DVD drive and its still spinning when you put it into sleep mode you don't get the sound.
P.

OSX Lion iMac fails to enter sleep mode.

Hello
My 2010 iMac fails to automatically enter sleep mode after upgrade to OSX Lion.
There is no problem using the keyboard shortcut or the sleep command in the menu.
However, it´s driving me crazy that it does do it by itself.
The energy saving options are set correct (enter sleep mode after 10 minutes).
I have tried to reset PRAM as well as SMC.
Internet sharing is turned off.
Any ideas......?

I have the same problem - late 2009 iMac, will not sleep after set period of inactivity. I have tried many things, including SMC and PRAM reset, 10.7.1 update, disabling Little Snitch, GlimmerBlocker, etc. etc., even removing Wacom tablet drivers and Flip4Mac, and disabling websharing (Apache), and switching internet sharing on and then off again. No difference. The only benefit is that I have learned I can sleep my Mac by pressing and holding the play button on the remote...
One thing I have noticed though is that I can hear disk activity when under 10.6 I would not expect it. Maybe something is accessing the disk and that is keeping my Mac from sleeping.

Mac Pro unexpectedly enters sleep mode

Ok so I installed Leopard last weekend on my Mac Pro and all initially went well with the install. After installation was done, software update appeared and stated I had approximately 4 downloads to install. So I had done this and prepared to reboot. Before rebooting, a window appeared stating that it needed to update the Boot cache. So I clicked on "OK" and the computer went into its shutdown sequence. When the computer reset, I noticed there was no start up chime and the system just sat there with a black screen. I thought perhaps it was updating the boot cache and it may take a while to finish. So I went afk for about an hour and came back. Still nothing. This is when I knew there was something seriously wrong with my system.
After speaking with Apple support and trying several things to get it to boot, the support rep stated that it will need to go into the shop for repairs. I had taken it to an authorized service center and they diagnosed the problem as a bad logic board. They had replaced this and had ran their diagnostic tools on it to make sure it was running normally. They kept it overnight and ran Apple Service diagnostics in a repeating loop on the system. They had also cold booted the system 30+ times per the work order.
After I brought it home and booted it, everything was seemingly running fine. Then I received a page from work (I'm a support rep) which required me to boot into Windows using Boot Camp to solve a client's problem. After I had done this, I booted Leopard back up and was playing around in it for a few minutes to check out some of the new features. I had then ran World of Warcraft to play a bit and to check out the performance increase in Leopard. After about 5 minutes of playing, my system unexpectedly entered sleep mode. Obviously I was confused so I had brought it out of sleep mode by hitting the enter key. The system came back for about 2 seconds and immediately went back into sleep mode again. This happened about 4 or 5 times before I finally shut the system down.
The first thing I did after reboot is to check the energy saver options. Both hard drive and monitor energy options were set to "Never". I then checked for software updates. There was both an SMC firmware update and a Boot Camp EFI(?) firmware update. I had done the SMC firmware update first and then after successfully updating this, I had done the Boot Camp firmware update. After reboot, the system went into sleep mode on its own approximately 5 minutes after reboot. This time I had made sure NOT to run my game as I had a suspicion that this could be causing the problem. It entered sleep mode anyway unexpectedly. After waking it up again by hitting the enter key, the desktop appeared again for about 2 seconds before going right back into sleep mode. I called the service center again and they said I would have to bring it in for them to look at. Needless to say, I am NOT very pleased.
Has anyone ever heard of anything like this happening with a Mac Pro? I had never had any problems when I was running Tiger with any application, not even my game. The service rep where I took it said it was just bad timing that the logic board went during my OS upgrade and that the two had nothing to do with each other. My brother has a Mac Pro as well and he had upgraded to Leopard. Of course his computer works fine where mine is a sleeping fool. Does anyone have any ideas or theories as to what could be causing this? More importantly, does anyone have any suggestions on how I might be able to fix this on my own? If you could please let me know, I would appreciate it. Thank you in advance for your time.

Wow, who are you dealing with? The first time my logic board was replaced, the techs never bothered with looking at anything else as being the problem. However, when I pointed out the power supply fan problem, they focused on that being the cause of the problem and fixed just that. I was somewhat concerned as I know some of these techs do not look at other parts of the machine as potential problem causers. I was afraid that I would hook up my system only to experience the same problem as before. Luckily, that was not the case.
I am glad that your system appears to have the same problem as mine did. I would suggest that if you take it back to them again for a fan fix to have them run the system for about an hour after replacing it. They should be opening apps, checking the iStat widget, etc to try and make it break. If they can't after an hour or so, I think it should be ok.
This whole ordeal makes me question the quality of parts used by Apple. My brother has an iMac G4 where the hard drive died after 2 months of getting it new. Now this issue with mine and yours with the bad logic board and the power supply fan. Who knows how many other customers report hardware related problems?

MacBook starts and instantly enters sleep mode

In the past few days I've been experiencing a reoccurring problem with my macbook pro. I press the power button, hear the startup of the drive, and then sometimes the display will turn on for a second(mostly stays off), and then enters sleep mode instantly. I can not get on my macbook unless I turn it on and let it sit for 15-20 minutes, then MAYBE the display will activate. Please help.

Do you hear a chime at startup? How do you know it is entering sleep mode and not turning off? Does the cursor move on the screen? Here is something from another user's experience:
I had the same issue with my 2008 iMac and Apple support walked me through the fix yesterday...
1. Shut the computer down by holding the power button for 10 seconds
2. Restart the computer and press shift at the same time until you see the progress bar start moving
3. Once you reach the point where your screen goes dark and you see the cursor, type the first letter of the username for your computer, then hit Enter, then type your password, then hit Enter.
4. After a moment, you should see the spinning beach ball
5. Your screen should then move on to something along the lines of "Completing OSX Installation" (I can't remember the exact wording). Let it finish. After that it should go to your normal desktop and the issue should be fixed. (If your screen goes pitch black during this process, hit the space bar. I thought it wasn't working, but the screen was just sleeping).
Apparently it's an issue with an automatic update that never quite got past the login screen.
MacBook Pro (15-inch, Mid 2010)- Intermittent black screen or loss of video

Turning off sleep mode during high CPU usage

There isn't option to prevent going to sleep mode during high CPU or network usage. This is not professional for serious work like 3D rendering, video montage, downloading or sending large files. Windows is going to sleep during performing serious tasks.
Setting different sleep mode values every time is no way because we didn't know how long these tasks will running.

There isn't option to prevent going to sleep mode during high CPU or network usage. This is not professional for serious work like 3D rendering, video montage, downloading or sending large files. Windows is going to sleep during performing serious tasks.
Setting different sleep mode values every time is no way because we didn't know how long these tasks will running.

Can't use mouse/keyboard/trackpad when waking iMac from sleep mode

Basically as the title says. When I wake my iMac from sleep mode I am unable to use my keyboard/trackpad/mouse during the login window. Once the screen goes black by itself, after a minute or so I can then log in properly.
Yes the keyboard/mouse/trackpad are all connected when it wakes from sleep as I can use any of them to wake it from sleep, I just can't move them or type with them in the login window.
Processor 3.4 GHz Intel Core i7
Memory 24 GB 1600 MHz DDR3
Graphics NVIDIA GeForce GTX 680MX 2048 MB
Software OS X 10.8.5 (12F37)

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Sleeping mode during a migration

My Mac Book Pro got into sleeping mode during a migration to new Imac, what should I do

What you're experiencing is not unusual; there are often problems gaining access to mailboxes on a different version of Exchange than the primary mailbox is on. Standard practice is to move managers and delegates together, including work groups that
share the same mailboxes.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

IPod 5G Freezes during Video Playback

iPod freezes during video playback. Does anybody else have this problem?
Usually freezes up about 10 minutes into a video, and then complety locks up. This usually requires 2 to 3 restarts untill it comes back working properly.

Mine does the same. It really only happens to me when I try to navigate thru menus when video is playing. I usually have to do a forced Reset. I truly think that introducing video on the iPod was not ready for primetime as it is very sluggish, buggy and sensitive during playbabck of video. No problems with music whatsoever but I am frustrated with the very finicky video qualities of this thing.

Mac mini keeps entering sleep mode

Hi. I have a Mac mini that has this annoying problem where it keeps
wanting to enter sleep mode. This problem seemed intermittent at first.
What I notice is that my mini would enter sleep mode whenever I try to
encode mp3. This seems reproducible. When it enters sleep mode,
I can wake it up by pressing the power button. However, it goes back
in sleep mode after a couple seconds after it wakes up. The only way
I can get it out of sleep mode is to quit iTunes and eject the audio
CD.
Things I've tried:
Energy Saver settings: Computer sleeps after 3 hours inactivity,
display sleeps after 3 hours inactivity, unchecked "Put hard disk(s)
to sleep when possible". I tried disabling energy save. No luck.
I also tried to uncheck "Allow Nap" box in the Processor settings.
However, it always checks this after a reboot.
If I insert a DVD movie, I can watch it w/o any interruption.
Anyone else seen this problem? Thanks in advance.
Jim

Hi Carl. I was unable to find com.apple.AutoWake.plist in my
system. Deleting com.apple.PowerManagement.plist didn't
help.
I decided to try your open firmware instructions. I like the
boot loader. It reminds me of the Sun's boot monitor.
I did the reset-nvram, set-defaults, reset-all. It didn't
help though.
I don't think it is my power supply, either. The reason why I
don't think this is the problem is I can watch DVD and listen
to audio CD just fine. My sleep problem would only occur
when I try to rip an audio CD. I can assure you that I draw
plenty of power just playing a DVD movie.
My guess is I have a power management configuration
issue or a hardware problem. Since this has a Unix core
underneath, I started poking around in the usual places
for log files. I found the familiar /var/log and stumbled
on system.log. Looking at the file, I found something
that caught my eye.
Aug 17 01:06:19 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Doing a 'grep overtemp system.log', I got the following:
Aug 17 01:04:13 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:04:37 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:04:56 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:05:37 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:05:51 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:06:00 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:06:13 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 17 01:06:19 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
If you look at the time stamp, you'll see that each event
is only a few seconds apart. This matches with what
I was seeing. Machine goes to sleep. I press the power
button and it wakes up and goes back to sleep. One
big endless cycle. The only way I managed to get out
of it is to quit iTunes and to eject the CD.
Yes, I did install the Xcode 2 development kit that came
with the Mini MAC OSX setup. I eventually want to write
software for the Mac. So, I most likely installed the
CHUD tools package that you had mentioned.
I think the equivalent command line command for
disabling the nap feature is 'hwprefs -v cpu_nap=false'.
When I do that, I get the overtemp event and my mini
goes to sleep. Zzz.
In any case, my mini seems to be detecting false overtemp
condition. Either I have a bad temp sensor or my power
management overtemp threshold is set way too low. It's
possible encoding audio CDs is enough to heat up the
PPC core, but it happens way too fast. I'm thinking my
temperature sensors are not set correctly. If anyone has
schematics for the mini, it would most likely be a Dallas
temp sensor chip. I'm not ready to open up my mini yet
since it is still under warranty. I'll take it in the Apple
store in Walnut Creek this weekend.
Anyway, thank you guys for all your help. I found my
experience on this forum to be quite pleasant. People
here are very helpful.
Jim

Lenovo thinkpad 8 not entering sleep mode when lid closed

RECENTLY I BOUGHT THINKPAD 8. I HAVE A PROBLEM. IT CAN'T ENTER SLEEP MODE. I CLOSE THE LID AND THE SCREEN IS ON. AT POWER OPTION IT IS SELECTED WHEN I CLOSE THE LID TO GO TO SLEEP , ON BATTERY AND WHEN PLUGED IN. THANKS FOR ANY HELP.
Solved!
Go to Solution.

I am not certain what you mean. Are you saying that when you close the cover it does not sleep? Are you certain you have a cover with the magnets that will put it to sleep?

My macbook pro 2.0 early 2011 will not go to sleep with the power source connected. only enters sleep mode when running on battery. Someone did this happen, and it could solve?

Alo, my Macbook pro i7 2 GHz Intel Core i7 (early 2011) will not go to sleep with the power source connected. only enters sleep mode when running on battery. Someone did this happen, and it could solve?

There is no output from that command line? Maybe the pid changed.
I'll repeat what I am trying to find out...
1. You do a pmset -g on the terminal.
2. The output from that pmset should have a line that says "sleep 0 (imposed by n)" where n is some number.
3. The ps ax | grep n is supposed to display what the process associated with n is.
It's the output from step 3 that should indicate what is causing you not to sleep.
But speaking of sleep, that's where I am going.

Computer enters sleep mode shortly after leaving sleep mode. Defect?

I have a problem. It's not a serious problem, but since it seems to be hardware related it might cause problem in the future.
It's pretty simple. Let's say I fold the computer screen down and leave the computer in sleep mode. If I then fold it up again it will automatically enter sleep mode once again 25-30 seconds after waking up. It doesn't matter what I do. I can be completely passive or open any app and move the cursor as much as I like. After roughly 30 seconds the screen turns black and I have to press a key to wake it up.
It never enters sleep mode any other time if I don't choose so, it's always after being in sleep mode already. And it happens 80-90% of the time, but I have not noticed a pattern for when it doesn't.
Naturally my settings are in order. I just updated it today and no difference after one attempt with the new OS version.
Any ideas?

Sleep.
Shutting down a Mac is never required. It is best to let it sleep, unless you are planning to not use it for a period of time considerably longer than a few days.

Home Sharing turns off as soon as my computer enters sleep mode. How can I work around this issue?

Home Sharing turns off as soon as my computer enters sleep mode. How can I work around this issue?

please start firefox in safemode (by pressing the shift-key while it is launching) & go to ''firefox > options > advanced > general'' & disable hardware acceleration.
for some background on that issue you can also refer to [https://bugzilla.mozilla.org/show_bug.cgi?id=812683 bug #812683]

IMac Enters Sleep mode during video playback

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