Imac waking itself up from sleep mode

i am very concerned about my imac it keeps waking itself up from sleep mode. i checked the prefrences and its not scheduled to wake itself up, do i have a virus?

OK jon,
We stil don't know exactly which iMac CRT you have but this is based on the 350 - 400 Slot loader and is from the service manual:
"Resetting the PMU on the Logic Board
Resetting the PMU (Power Management Unit) on the logic board
can resolve many system problems. Whenever you have a unit that
fails to power up, you should follow this procedure before
replacing any modules.
1. Disconnect the power cord and check the battery in the battery
holder (BT1). The battery should read 3.3 to 3.7 volts.
If the battery is bad, replace the battery, wait ten seconds,
and then reset the PMU (refer to the next step). If the battery
is good, go to the next step.
2. Press the PMU reset switch (S1) once on the logic board and
then proceed to step 3. Do NOT press the PMU reset switch a
second time because it could crash the PMU chip.
3. WAIT ten seconds before connecting the power cord and powering
the computer on. If the computer powers on, go to the
next step. If the computer does not power on, there is something
else wrong with the computer, refer to the symptom/
cure chart, “No Power” in this chapter."
Richard

Similar Messages

IMac Waking Itself Up From Sleep

My Intel iMac has taken to waking itself up when I put it to sleep. It's happened once or twice before in the past, but over the past few days it seems to have become a regular thing.
I put it to sleep by pressing the power button on the back, and the around 30 minutes later it will wake itself up despite me being nowhere near the keyboard or mouse.
Any ideas what could be causing this and how I could fix it?
I don't know whether it's related or not, but my Aluminium Bluetooth Keyboard has recently been playing up too and keeps giving me a Connection Lost message.

OK jon,
We stil don't know exactly which iMac CRT you have but this is based on the 350 - 400 Slot loader and is from the service manual:
"Resetting the PMU on the Logic Board
Resetting the PMU (Power Management Unit) on the logic board
can resolve many system problems. Whenever you have a unit that
fails to power up, you should follow this procedure before
replacing any modules.
1. Disconnect the power cord and check the battery in the battery
holder (BT1). The battery should read 3.3 to 3.7 volts.
If the battery is bad, replace the battery, wait ten seconds,
and then reset the PMU (refer to the next step). If the battery
is good, go to the next step.
2. Press the PMU reset switch (S1) once on the logic board and
then proceed to step 3. Do NOT press the PMU reset switch a
second time because it could crash the PMU chip.
3. WAIT ten seconds before connecting the power cord and powering
the computer on. If the computer powers on, go to the
next step. If the computer does not power on, there is something
else wrong with the computer, refer to the symptom/
cure chart, “No Power” in this chapter."
Richard

I upgraded to Mountain Lion.Now I have trouble waking it up from sleep mode. Why?

I upgraded to Mountain Lion on my MacBook. I am now having trouble waking it up from sleep mode. Does anyone know why or how to wake it up. I try tapping the space bar, trackpad & other keys. Sometimes I think it's never going to wake up.

I'm not certain but my new MBA 13...when in sleep mode comes back on from a black screen when I simply click on the left mouse button. Also, one time I did a SECURE EMPTY TRASH on files that totalled more than 1GB and it took so long that the fan kept increasing in speed so I pressed on the POWER button and the MBA shut...I was able to boot up with no problem. As a rule, I now only do secured erases for trash bin data totalling 500mb or less...anything above that gets a regular erase (dump).

IMac with waking up randomly from sleep mode

Hello everybody!
Since I installed Snow Leopard (all updates done) my iMac is randomly waking up from sleep mode without any reason that I know of. Some days everything is fine, next day it wakes up when I am at work and retrieves mails (thats how I see it is awake).
Also I set it up to shut down after 1h idle time- this does not work as well.
Any ideas how to track the problem?

re:
Just happened again.
My activity monitor:
123 AirPort Base Station Agent 0,0 3 856 kB
2974 Aktivitetsmonitor 8,6 6 20,2 MB
293 AppleSpell.service 0,0 2 5,8 MB
105 Dock 0,0 3 10,0 MB
107 Finder 0,0 6 35,8 MB
109 fontd 0,0 3 5,0 MB
129 GeekTool 0,9 4 3,6 MB
188 GrowlHelperApp 0,0 3 10,3 MB
127 iTunesHelper 0,0 3 1,5 MB
99 launchd 0,0 2 836 kB
29 loginwindow 16,5 2 7,5 MB
152 Mail 0,0 7 60,3 MB
2977 mdworker bjarne 0,0 3 3,2 MB
110 pboard 0,0 1 488 kB
128 Quicksilver 0,0 3 19,6 MB
154 Safari 0,0 9 207,1 MB
2985 snmpInk 0,0 3 1,8 MB
106 SystemUIServer 0,3 4 19,8 MB
117 UserEventAgent 0,0 3 3,3 MB
239 WebKitPluginAgent 0,0 2 696 kB

My imac has a gray screen when waking it up from sleep mode. about 9 months ago, I installed OS X Maverick.

This is the second time this has happened, since installing OS X (9 mos. ago). (I can't recall the fix from the last incident.) Upon waking the pc up from sleep mode, I get a gray screen. Nothing works except using the Command and P & R keys to get to "reinstalling OS X", to no avail. What do I need to do to get it back to normal?
My imac is a 21.5", mid 2011 item.

Those keys do not reinstall OS X. To do that:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.
COMMAND-OPTION-P-R keys resets the PRAM. OS X keyboard shortcuts.

Not detecting external display after waking up MBP from sleep mode

I am a recent owner of a MBP and enjoying it. However, one problem that I can't seem to find a solution to is the external display problem after sleep mode.
When I first boot up the Mac and plug in my Dell external monitor via the mini adapter, there is no problem with detection or display. However, every time I put the MBP in sleep mode and then wake it up again, the external monitor does not "wake" up and my MBP only displays my normal screen on the Mac.
I tried to 'Detect Displays' to no avail and the only solution is unplugging the mini connection and plugging it back into the MBP for the MBP to re-detect the external monitor.
Although this is a quick fix in itself, I do not want to wear out the mini port by doing this every timeI come out of sleep mode. Any solutions so that the external monitor will detect the MBP waking up from sleep and display properly? Thanks!

And same problem here.
Using a MBP 2.66 i7 with a Dell 3008WFP that's connected to the MBP through DisplayPort. It works some of the time but once in a while (only been using the new MBP for a couple of days now) the monitor won't come out of sleep mode. Turning it off/on causes OS X to completely ignore the monitor. I was able to get this setup to work again by pressing 'Detect Displays' in the System Preferences pane but most of the times that doesn't help. The only sure way to get the monitor working again is by booting into Windows through Bootcamp, Windows is able to use the monitor, if I reboot after that OS X sees the monitor again.
Also saw a magenta line/stripe on the left side of my monitor and the monitor sometimes makes a buzzing sound when connected to the MBP through DisplayPort. That's what you get by using bleeding edge tech I guess :\ Only alternative is buying the mini-DP to dual-DVI connector but paying $99 just to be able to use an external monitor is rather insane. Besides that lots of users are having problems with this adapter.

IMac won't wake from sleep mode after latest update

Hello, I have a Late 2013 27-inch iMac that has started acting strange, lately. After installing update 10.10.3, my iMac almost will regularly not wake once it enters sleep mode, after being idle for a certain period of time.
Is anyone else having this problem, and/or have any solutions for this?
Thank you in advance!

Step 1
Take all the applicable steps in this support article. That's the starting point for any further efforts to solve the problem. Please read the whole article carefully and don't skip any of the steps, including the ones under the heading Additional troubleshooting. If you don't understand any of the steps, ask for guidance.
Also note that if you replaced the internal hard drive with an SSD, or if you're starting up from an external SSD, then that device may be causing the problem. Check the SSD manufacturer's website for a firmware update. The only solution may be to reinstall the original drive or avoid sleep altogether.
Step 2
If you're running OS X 10.8.5 or earlier, from the menu bar select
           ▹ System Preferences... ▹ Accessibility
If the checkbox at the bottom marked
          Enable access for assistive devices
is checked, uncheck it and test.
If you're running OS X 10.9 or later, select
           ▹ System Preferences... ▹ Security & Privacy ▹ Privacy ▹ Accessibility
If any applications are listed on the right and have a checked box next to them, uncheck all the boxes and test. You may first have to click the padlock icon in the lower left corner of the window and authenticate as an administrator to unlock the settings.
Step 3
In the Energy Saver pane of System Preferences, uncheck the box marked
          Put hard disks to sleep when possible
Step 4
If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.
Step 5
This and the next step must be taken as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ Diagnostic and Usage Messages
In the search box in the window's toolbar, enter "powerd" (without the quotes.)
You may see one or more lines like this:
com.apple.message.signature: Platform Failure
If you do see that, and you did everything in the preceeding steps, then you're dealing with an internal hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Step 6
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that heading, select
          View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down.
You may see one or more reports with a name that begins with "Sleep Wake Failure" followed by a date. Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
I know the report is long, maybe several hundred lines. Please post all of it anyway.

How do I start up my computer when the screen is black after "waking" it up from sleep mode and/or turning it on from the shut down?

I really need help! I just got this MacBook Air almost two weeks ago. It is a refirbished one. Now lately, when I put it to sleep and then get back to it, it won't wake up. It just gives me a black screen and a running noise. Sometimes it does it too when I shut it down. And sometimes it will work fine as if it never happens-i move the mouse and the computer starts up. I am deaf and living on campus for school, so there is no chance for me to get some help through a simple phone call and there is no nearby apple stores or providers.
Please help me, I do not want to go back to my Dell computer.
Ronni.

I'm not certain but my new MBA 13...when in sleep mode comes back on from a black screen when I simply click on the left mouse button. Also, one time I did a SECURE EMPTY TRASH on files that totalled more than 1GB and it took so long that the fan kept increasing in speed so I pressed on the POWER button and the MBA shut...I was able to boot up with no problem. As a rule, I now only do secured erases for trash bin data totalling 500mb or less...anything above that gets a regular erase (dump).

IMac won't wake from sleep mode

Just wanted to share my experience in case anyone has this issue.
Computer would only start after sleep mode if I unplugged the power cord. The power button would not do anything, even if I held it for a long time.
Shut down and start up would work normally. Only effected sleep mode.
After much trouble shooting I found that I had a bad USB hub. Everything on the bad USB hub would work fine so I didn't suspect it.

Very interesting, thanks for sharing.

USB doesn't wake up after waking MacBook Pro from Sleep Mode

I have a problem with my new MacBook Pro.
I attach an Apple 20" cinema display to the macbook pro USB connector and then I attach my apple keyboard and mouse to my cinema display.
When I wake up my macbook from being asleep my mouse and keyboard are not activated. I have to unplug my cinema display USB connector and unplug my keyboard from the display and then plug them all back in again to get them to re-activate.
Anybody know why this is occurring, its very frustrating each time my machine goes to sleep

In that case, does the problem still exist when starting up the MBP in Safe mode and then putting it to sleep and awakening it?
http://support.apple.com/kb/HT1455

IMac G5 shuts down from Sleep mode

My iMac G5, PPC, 10.4.11 goes to sleep when told or scheduled. Clicking the mouse or a key to wake up the system causes it to power down. We have been running 10.4.11 for some time, no system upgrades.
Any thoughts?

I have an early iMac G5 as well. Resetting the SMU is worth trying, but I hope you don't have a hardware problem. Early iMac G5's are notorious for having power supply failures which can lead to SMU/sleep/shutdown issues. Apple provided a [recently-ended|http://www.apple.com/support/imac/repairextensionprogram> 3-year repair extension program for early iMac G5s with power-related problems, and I ended up needing two replacement power supplies and a replacement logic board for mine.
There have been a number of discussions about iMac G5 shutdown issues, including suggestions for replacement hardware components if needed, at the iMac G5 forum here:
http://discussions.apple.com/category.jspa?categoryID=134

HELP! My iMac freeze when awaken from Sleep mode

Its unusual... I think its because of the updates. I have the latest version of Leopard. Can anyone help? I hate to reboot my machine as i heard its not good to do often.

Hello xoxo:
That is not normal.
This article will explain how to reset the System Management Controller (SMC):
http://docs.info.apple.com/article.html?artnum=303446
If that does not help, I would take the computer to either en Apple store or to an Apple-certified technician for diagnosis.
Barry

Bizarre app behavior after waking from Sleep Mode

My iMac Core Duo runs like a top. It is fast and quiet. I have no problems with applications, both Universal and PowerPC. I maintain it with everything that I suggest others do in posts.
But, there is this one strange quirkiness that I have put off mentioning because I kept hoping that each new OS X update would address the issue. It has to do with waking my Mac from sleep mode with it logged into my user account. Not every time, but most of the time, if I put my Mac to sleep or it goes to sleep from inactivity while it is logged into my user account, I experience strange application behaviors upon waking.
For example, upon awaking Mail.app will contact my .Mac account and download any new mail that has arrived. But, if I try to open any of this mail, instead of opening, Mail.app will open a new outgoing email addressed to whomever sent me the mail I tried to open. Quitting and restarting does not solve this problem. Other apps demonstrate similar bizarre behavior. To only way to solve the issue is to log out and back into my user account.
However, if I log out of my user account and then put the Mac to sleep from the Login Manager I don't experience this issue. So at night I always log out before putting the Mac to sleep.
Anyone else experiencing similar issues? Any ideas on solving this? Do you think it is a bug in Universal Mac OS X?

Sorry this isn't a solution, rather is a commiseration. Often after my iMac wakes from sleep mode it refuses to see my internet connection. I have to unplug and reset my DSL modem to force the computer to see that it exists.
It sounds like the problem might be related, does anyone have any brilliant suggestions?
Thanks,
Lonnie

After start-up from sleep mode, Mail 6.2 shuts down and needs to be rebooted

After starting my iMac (Mountian Lion OS) from sleep mode and then staring Mail, Mail will crash (shut down) and needs to be restarted. This does not happen every time but enough to be annoying. Does anyone else also experience this and is there a fix? I have sent problem reports to Apple but they just seem to go into a black hole with no response. I would appreciate any help or advice. Thanks in advance.

I am also seeing the symptoms of this on my large (3500+) network of macs. We have seen it happen on MacBooks and MacBook Pros. I am curious to know do you have multiple airports in your environment or a single airport?
Also have you found any way to mitigate these effects (i.e does it still happen if you go to the apple menu and choose the sleep command)
Just curious, I want to find a solution to this because it seems to be very similar to what our users are seeing.

Everytime I wake up my computer from Sleep Mode the sound starts to crackle on my X-Fi?

Sometimes I'll be playing a song and a few seconds in it starts to crackle and distort the music. I notice that it only happens after my computer wakes up from sleep mode. Usually restart can fix the problem.
I have an original X-

Okay, I seem to have solved the problem I posted about earlier. I noticed that the language preference in the upper right hand corner of the screen (between the date and time and the Spotlight icon) had somehow gotten switched from American English to French. When I switched it back to American English, my password worked when waking the computer from sleep mode. I have no idea why changing the language preference would affect the way the password works but that seems to have been the case. I'll post again if I experience more problems.

Imac waking itself up from sleep mode

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