IMac wakes from sleep with a black screen.

Twice since installing Yosemite, my iMac has woken from Sleep with a completely black screen. I can see a small Apple menu logo top left and the login button but I have no control from the keyboard, trackpad or mouse.
The only remedy is to switch off the power and restart, which I should not be doing.
Is there a link to send a report to Apple on this?
Thanks.

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T430s intermittently wakes from sleep with a black screen

and since you can't see anything, you have to force a power down and lose whatever you're working on. It's almost like the back light is out, but its not. Its just a sold black screen. When I hook it up to an external monitor - which it is most of the time - that screen just displays the black screen.
This laptop has the nvidia gpu. I've uninstalled the drivers, reinstalled, switched between gpus, and I'm at a loss. Any suggestions?
Windows 7 OS.
Thanks for any thoughs,
Fritz

I found this in the event log. Not a very helpful log, I'm afraid...
Log Name: System Source: Microsoft-Windows-Power-Troubleshooter Date: 7/18/2013 7:26:57 PM Event ID: 1 Task Category: None Level: Information Keywords: User: LOCAL SERVICE Computer: REALTIME_T430
Description: The system has returned from a low power state.
Sleep Time: ‎2013‎-‎07‎-‎18T22:38:22.500103200Z Wake Time: ‎2013‎-‎07‎-‎18T23:26:55.177854500Z
Wake Source: Unknown
Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-Power-Troubleshooter" Guid="{CDC05E28-C449-49C6-B9D2-88CF761644DF}" /> <EventID>1</EventID> <Version>2</Version> <Level>4</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2013-07-18T23:26:57.043896100Z" /> <EventRecordID>53170</EventRecordID> <Correlation ActivityID="{75F763C8-ED1A-4295-BA4E-631048C9040D}" /> <Execution ProcessID="2704" ThreadID="12596" /> <Channel>System</Channel> <Computer>REALTIME_T430</Computer> <Security UserID="S-1-5-19" /> </System> <EventData> <Data Name="SleepTime">2013-07-18T22:38:22.500103200Z</Data> <Data Name="WakeTime">2013-07-18T23:26:55.177854500Z</Data> <Data Name="SleepDuration">6750</Data> <Data Name="WakeDuration">679</Data> <Data Name="DriverInitDuration">497</Data> <Data Name="BiosInitDuration">364</Data> <Data Name="HiberWriteDuration">0</Data> <Data Name="HiberReadDuration">0</Data> <Data Name="HiberPagesWritten">0</Data> <Data Name="Attributes">16652</Data> <Data Name="TargetState">4</Data> <Data Name="EffectiveState">4</Data> <Data Name="WakeSourceType">0</Data> <Data Name="WakeSourceTextLength">0</Data> <Data Name="WakeSourceText"> </Data> <Data Name="WakeTimerOwnerLength">0</Data> <Data Name="WakeTimerContextLength">0</Data> <Data Name="NoMultiStageResumeReason">0</Data> <Data Name="WakeTimerOwner"> </Data> <Data Name="WakeTimerContext"> </Data> </EventData> </Event>

IMac wakes from sleep with a key stuck

I routinely wake up my computers from sleep by pressing a modifier key like shift, command, etc; these keys don't generally cause actions in whatever software is running so they make good "wakeup" buttons.
I recently got a new 20" aluminum iMac, which I love, but it seems that once in a while a key gets stuck. The shortcut menu appears when I try to click on something, or text will get selected, or everything acts like I'm right-clicking. If I do a quick run through all the modifier keys, the problem goes away until the next time I wake the machine. So since getting the new iMac, my routine was changed to pressing a modifier key, waiting till the machine wakes up, then pressing all of the modifier keys.
I discovered today that what's happening is, when I do my regular wake-up thing, whatever key I pressed while the machine was sleeping gets stuck until the next time it's pressed. It's like the key press message is getting to the machine, but the release is ignored while the computer is in the process of waking up. It thinks I'm still holding that particular key down. So now what I do is press one key, then press it again when the computer's awake.
The problem only occurs when the machine goes to sleep due to inactivity. I can't reproduce it by invoking sleep from the Apple menu or the keyboard shortcut.
This never happens on my Core Duo iMac or on my MacBook Pro. It does, however, happen every time on this machine whether I use the included aluminum keyboard or the old white keyboard.
I just got the idea of holding down the the shift, control, or whatever key, until the machine has fully recovered from sleep. I will post further if anything interesting happens when I try it.
I'd like to get things back to the way they were before though (except I want the new iMac to stay of course!). Any ideas?

If I wake the computer by pressing, for example, control; then wait for the system to recover before releasing it, everything's fine.
It looks like the computer is just not aware of USB activity during the waking process.
Does this happen to anyone else, or is it just me?
I did install the EFI updates last week too. I was kind of excited to see them because I figured they'd noticed the problem and fixed it, but it had no effect.
Re the TIL article above, this appears to pertain only to portables. Is it also something that works on iMacs?

IMac wakes from sleep on its own with Yosemite

After installing Yosemite, my iMac wakes from sleep all on its own multiple times throughout the day and night. The screen does not turn on when this occurs and it goes back to sleep on its own. I figured the my energy settings may have changed after the upgrade, but nothing is different. I have no schedule set and the "wake for network access" is unchecked.

To my knowledge, any Mac that is 1. connected to power and 2. not powered down will wake periodically for the reasons I explained, and perhaps for additional reasons known only to Apple. If disabling "wake for network access" does not change anything, all I can say is that it's working as Apple intends it to work. Before you ask, I strongly discourage you from finding clever system "hacks" or workarounds to prevent your Mac from working as designed.
It may or may not be a bug. Whether it is or not though, if it bothers you, consider providing feedback to Apple.
When questions such as yours arise, it helps to look at iOS. iPads and iPhones will all periodically connect themselves for the purposes of downloading emails, Messages, alerts etc. There is no way to disable that, other than to completely power down the device, which almost no one does. Apple has been inexorably changing OS X to effectively implement iOS design features such as this – for better or worse is not for us to say.
May I ask why this concerns you? Perhaps that would lend some insight regarding possible solutions.

Folder always opens when imac wakes from sleep

Don't think its a huge problem but when new imac wakes from sleep the same folder always pops up on screen(shaded in black). It always has to be closed before I can proceed with anything.Any suggestions would be appreciated. Also the folders name is always highlighted red. Thanks

Searching the web for "appcode.hex" the first item that I found was for something related to an Olevia TV.
A .exe file is a Windows file and will not run under Mac OS X.
Installer Vise "Creates software installers for Windows or Macintosh.(MindVision Software)"

External hard drives ejecting after iMac wakes from sleep.

External hard drive keeps ejecting after iMac wakes from sleep. TM does not recognise, so have to unplug then re plug in Ext HD, only then TM will perform a back up. Not seamless backups. Help to resolve would be grand

Ive got the same problem with a Western Digital 500GB My Book Pro on my iMac Ive tried it on a few other machines and I think its happened on them, I say think because it was only when it had happened a couple of time that I started to take notice of circumstances etc and ive only had the drive a week, downloaded what may be a more uptodate "My Button manager" from the WD site still happened but Ive got this idea that it didnt happen on one machine which may not have had the MyButton thing on at that time, have you solved it yet I am using USB at the moment.
20" iMac 2.13Ghz Mac OS X (10.4.8)

Intuos4 tablet won't work when iMac wakes from sleep

Whenever my iMac wakes from sleep my Intuos4 tablet no longer functions (I use it in place of my Magic Mouse). Has anyone had this issue?

Viking501,
You may want to mark this thread with a correct answer which you will find in the Legend to the right. This may help other people with a similar issue.

No wake from sleep with upgrade to 10.10.3

I recently upgraded a new iMac Retina 5K to Yosemite 10.10.3. Since the upgrade, the iMac will no longer wake from sleep. The screen remains black. I have to hold the power button for several seconds to reboot the machine. I am using the standard Bluetooth keyboard and Trackpad.
I have tried reseting the SMC, PRAM, and booting into Safe Mode (none of which fixed the problem). I know I can turn sleep off via Energy Saver, but my workflow makes using sleep a better option for me.
I looked in the system logs and find a dozen of the following messages after I try to wake from sleep:
Apr 12 12:10:12 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 1 ****
Apr 12 12:10:22 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 2 ****
Apr 12 12:10:32 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 3 ****
Apr 12 12:10:42 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 4 ****
Apr 12 12:10:52 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 5 ****
Apr 12 12:11:02 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 6 ****
Anyone know what the problem is and how to fix it?

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.

New iMac wakes from sleep sluggishly and requires password despite preference setting

My new iMac (Core i7) wakes from sleep very sluggishly and it requires a password despite the fact that I have de-selected this option in Preferences.
I have a new iMac. I used Migration Assistant to move everything from my older Mac Pro, which was running Lion. Under the Secucrity settings in Preferences, I de-selected "Require Password."
I use a bluetooth mouse and wireless keyboard. Typically I click the mouse to wake up my Mac. The screen comes to life and the cursor moves with the mouse, but...how can I explain this? When I move the mouse in this situation, the cursor paints a gray swath over the desktop screen. It looks like I am using a paint program.
After clicking the mouse repeatedly the computer becomes responsive and the password entry screen appears--most of the time. I have tried to set it up so a password is not required, but usually I get this screen. SOMETIMES, it behaves correctly--say one-fourth of the time.
Another problem... When I shut the iMac off and then back on, it does not always link to my Apple bluetooth mouse. I have to connect a USB mouse and re-link the wireless mouse.
I wonder if this is a software/OS issue. My old Mac Pro had similar wake-up issues, and I wonder if Migration Assistant transferred them to my new machine.
Your thoughts and great ideas are appreciated.
John Graham
Fort Collins, CO

I too am having trouble with my bluetooth mouse after upgrading to 10.7.2 and the associated iOS 5 upgrades. The mouse keeps losing its connection. I've turned bluetooth off, trashed the preferences, rebooted and repaired both the keyboard and mouse but the mouse keeping dropping out. Keyboard seems ok. Anyone have any ideas?
Len

G5 randomly wakes from sleep usually near midnight-screen sometimes flashes

Since handing down my G5 to my mom, it randomly wakes from sleep. I always notice that it happens at night because then I can see the light from the display. Not sure if it happens exactly at midnight each night but its usually near then. I just get up and put it back to sleep and its usually fine until the next night.
Occasionally when this happens the screen will flash - it will flash the desktop, then a black screen - and on and on. The only thing I could think of that might wake it up was that I used to have it set to speak the time every hour, but I have turned that off. Any suggestions?
10.5.8
Dual 1.8 GHz powerpc G5
2.25 gb ddr sdram

macbookg5 wrote:
Since handing down my G5 to my mom, it randomly wakes from sleep.
You might learn more about why that computer is waking up by launching the Console utility and looking for messages around that time. If you see messages that might be related but don't understand them or aren't sure what to do about them, post them here and someone may be able to help.

MBP Wakes From Sleep With Lid Shut

My MacBook Pro (only about 1 1/2 months old) wakes from sleep while the lid is shut. I close the lid to put the computer in sleep mode and wait until it has fully entered sleep mode (the white light pulsates). If I then pick the computer up and rotate it some, more often than not it sounds as if the hard drive kicks back on and the apple logo on the top of the screen briefly illuminates. Sometimes I have even noticed that the screen will illuminate; however, the most consistent things I've noticed are the hard drive and logo. This is all while the lid is still closed.
I spent around 1 1/2 hours on the phone with Apple support yesterday with no result. I thought I would see if anyone has an explanation or idea here before I send the computer off to Apple.

Hi again,
your statements that the workaround does not "work around"
on your machines confuses me a bit. It looks like the changes
in the com.apple.PowerManagement file don't produce the desired
effect.
First question: Did you restart your computers after having
applied the changes ? If not, try this first.
Can it depend on the model of MBP (I have the new Santa Rosa) ?
If I save the file as an ASCII file it looks like this:
ActivePowerProfiles = {"AC Power" = -1; "Battery Power" = -1; };
"Custom Profile" = {
"AC Power" = {
"Automatic Restart On Power Loss" = 0;
"Disk Sleep Timer" = 0;
"Display Sleep Timer" = 0;
"Display Sleep Uses Dim" = 0;
"Hibernate File" = "/var/vm/sleepimage";
"Hibernate Mode" = 3;
"Mobile Motion Module" = 1;
"System Sleep Timer" = 0;
"Wake On AC Change" = 0;
"Wake On Clamshell Open" = 0;
"Wake On LAN" = 0;
"Battery Power" = {
"Disk Sleep Timer" = 10;
"Display Sleep Timer" = 5;
"Display Sleep Uses Dim" = 1;
"Hibernate File" = "/var/vm/sleepimage";
"Hibernate Mode" = 3;
"Mobile Motion Module" = 1;
ReduceBrightness = 0;
"System Sleep Timer" = 15;
"Wake On AC Change" = 0;
"Wake On Clamshell Open" = 0;
System Profiler says:
Einstellungen für Stromversorgung des Systems:
Netzbetrieb:
Ruhezustand des Systems (nach Anzahl von Minuten): 0
Ruhezustand der Festplatte (nach Anzahl von Minuten): 0
Ruhezustand des Monitors (nach Anzahl von Minuten): 0
Bei Stromverlust automatisch neu starten: Nein
Ruhezustand bei Änderung der Stromversorgung beenden: Nein
Ruhezustand beim Öffnen des Computers beenden: Nein
Ruhezustand bei administrativen Netzwerk-Zugriffen beenden: Nein
Zum Ruhezustand des Monitors den Monitor abdunkeln: Nein
Batteriebetrieb:
Ruhezustand des Systems (nach Anzahl von Minuten): 15
Ruhezustand der Festplatte (nach Anzahl von Minuten): 10
Ruhezustand des Monitors (nach Anzahl von Minuten): 5
Ruhezustand bei Änderung der Stromversorgung beenden: Nein
Ruhezustand beim Öffnen des Computers beenden: Nein
Zum Ruhezustand des Monitors den Monitor abdunkeln: Ja
Helligkeit verringern: Nein
(German only, sorry)
And - I checked it just a minute ago - i works ! My MBP
goes to sleep when lid is shut and does NOT wake, when I
open the lid. After pressing a key, it comes to life again.
Regards,
Robert
P.S. Please have a look at the files in the
Library/Preferences/System Configuration Folder.
Is there only one file for Energy preferences or
did your system create another one, when you tried
to change settings via System Preferences ? I saw
this one time a few weeks ago, but I don't know
the exact conditions under which that happened.
Message was edited by: gandalf22

Networking issues following upgrade to 10.5.8 when iMac wakes from sleep

Hello,
I recently upgraded to 10.5.8 and I'm now experiencing issues with network connectivity following the iMac waking from sleep. I have to stop Airport and then start it again to resolve the issue.
Can you provide any resolutions to this or advice?
Many Thanks,
Sam

Reinstall the Mac OS X 10.5.8 Combo Update because the Combo seems to help a lot of people when a Delta upgrade doesn't take right.

T410 fails to wake from sleep with 2nd Hard drive installed?

Ever since I've installed a second hard drive in my T410, a Hitachi 250GB drive, my machine fails to wake from sleep (sometimes)... Then I have to do a hard reset.
I had the same problem without the 2nd drive when I tried to use the HD Password in the BIOS and found out that it was something to do with the Crucial M4 drive I'm using. But this same problem is now happening ever since using the 2nd drive slot.
Any ideas? I really like the extra storage space and don't want to remove it based on this problem.
T410(2537) -- i7 620M - Intel HD GPU (1440 x 900) - 8GB RAM - 128GB Crucial M4 SSD - 250GB Hitachi HDD - Windows 7 & 8 Pro
Solved!
Go to Solution.

Well it seems the problem was caused by the firmware version for the SSD I've installed.
The problem was resolved by updating the Crucial M4 SSD with the latest firmware.....
......and It solved the HD1 password issue too.
T410(2537) -- i7 620M - Intel HD GPU (1440 x 900) - 8GB RAM - 128GB Crucial M4 SSD - 250GB Hitachi HDD - Windows 7 & 8 Pro

Mac Mini distored image on wake from sleep with HD TV

I've got a Mac Mini that does this when it wakes from sleep:
http://www.youtube.com/watch?v=AlqYc8qH7ps
The image is distorted for several minutes and eventually corrects itself. It happened in 10.6 and now happens in 10.7, it's actually worse in 10.7
The Mini is connected to a Vizio 55" LED LCD TV via HDMI. I've had the logic board replaced twice and the RAM has also been replaced.
If I change the resolution setting it also fixes the image.
I was able to test it on another TV also a Vizio but different model. That was in 10.6 and the problem happened there too.
Once the image is fixed it runs fine. Though I do find that movies play a little stutteringly particularly noticeable via slow pans but that may not be related to this issue.

I've got a Mac Mini that does this when it wakes from sleep:
http://www.youtube.com/watch?v=AlqYc8qH7ps
The image is distorted for several minutes and eventually corrects itself. It happened in 10.6 and now happens in 10.7, it's actually worse in 10.7
The Mini is connected to a Vizio 55" LED LCD TV via HDMI. I've had the logic board replaced twice and the RAM has also been replaced.
If I change the resolution setting it also fixes the image.
I was able to test it on another TV also a Vizio but different model. That was in 10.6 and the problem happened there too.
Once the image is fixed it runs fine. Though I do find that movies play a little stutteringly particularly noticeable via slow pans but that may not be related to this issue.

2012 21.5" iMac wake from sleep white screen probs

I have my new 2012 21.5" iMac. It's a top end one with fusion drive for ref. when I'm waking it from sleep I get a total white screen, with the time in digital in the top RH corner, and nothing.
First few times I had to hold down the power button to restart it. This time I shook the mouse and had the effect whereby it "colours/reveals" the screen when I move about, pixel by pixel if you understand?
By doing this I was able to see my login n,ae, clicked this and the screen went to my password ask screen, which was fine.
Bit worried on this as its a brand spanning new iMac. Is it just me or is my iMac (already) faulty? I'm sure I had it a few times on my old 2007 Alu iMac as well.
Any help?
Cheers

Resolution
Move the mouse or trackpad cursor over the center area of the login window so you can see the user icons. Click on the icon of the user that you would like to login as, type in the user's password, and press Return.
If the login window is configured to show only the name and password fields, type in the user's name and password into the fields, and press Return (even if you cannot see the rest of the login window).
Additional Information
This issue will not occur if the display is not sleeping when the account is logged out. Use the steps below to confirm that the account is not configured to log out automatically while the display is sleeping:
1. Open System Preferences > Security & Privacy > General. Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
2. Open System Preferences > Energy Saver and configure Display Sleep to occur after the account is logged out, by dragging the slider to a number of minutes that is greater than N was set to in the previous step.
Important: If automatic log out is not needed, disable "Log out after Nminutes of inactivity" in System Preferences > Security & Privacy > General. This will also prevent the issue.
http://support.apple.com/kb/TS4135?viewlocale=en_US
http://km.support.apple.com/library/APPLE/APPLECARE_ALLGEOS/TS4135/TS4135_01-osx _1072-login_window-001-en.png

IMac wakes from sleep with a black screen.

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