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.

Similar Messages

My imac has a gray screen and spinning wheel and will not start up

my imac has a gray screen with a spinning wheel but will not start what does this mean?

Probably a damaged or failed HD. Please read Gray screen appears during startup on how to troubleshoot and what to do.

Retina Mac shows gray screen when waking up: what to do besides loosing work?

(see also http://apple.stackexchange.com/questions/96188/retina-mac-shows-gray-screen-when -waking-up )
This is the first time that my Retina MacBook Pro wakes up from sleep with a gray screen. After about 10-20 seconds, the MacBook falls asleep again.
Some points that might be relevant:
The only difference between power adapter and no power adapter is that with power adapter it does not go to sleep again.
The battery is almost full (I closed the lid last night when it was about 90%)
An external monitor was not attached when sleeping it, so I don't think How to fix a Macbook that does not always draw its internal screen after waking from sleep and having unplugged external display while asleep? applies.
I've run gfxCardStatus, almost always in "force integrated mode" (to conserve battery). And normally it wakes up correctly.
I run VMware Fusion 4.
All software is up-to-date and fully patched.
I tried to plugin an HDMI monitor and switch displays with Command-Fn-F1 and Command-Fn-F2, but that did not help (it would not switch displays).Before trying to:
reboot (by force a power off),
reset SMC
and/or reset PRAM/NVRAM
What options do I have that do not loose my work?
sleep-wake retina-macbook-pro battery

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.

I have a password problem. After importing data and settings from one MacBook Pro to a new one, I have to put my iCloud password in when re-starting, but the password from the old computer in when waking the computer from sleep.

I have a password problem. After importing data and settings from one MacBook Pro to a new one, I have to put my iCloud password in when re-starting the new computer, but the password from the old computer in when waking the computer from sleep. I want to use my iCloud password on both computers consistently. How can I fix this?

The only other place to change a password for the computer login is in Users & Groups preferences. But I don't really know enough here to fix your problem. You can try fixing the keychain:
iCloud- Frequently asked questions about iCloud Keychain
Tutorial: Resolving Keychain Issues
If you can't access your keychain, or forget your password If you can't get into your keychain file because you've forgotten your password or the keychain file appears to be corrupt, there are a couple of options.
First, if you've forgotten your password, you can use the "Keychain First Aid" utility to make the keychain password the same as the login password. This can be accomplished via the following process:
1. Open Keychain Access (located in Applications/Utilities)
2. Go to the "Keychain Access" menu and select "Preferences"
3. Click the "First Aid" tab
4. Make sure the "Synchronize login keychain password" box is checked
5. Close the Preferences window
6. Go to the "Keychain Access" menu and select "Keychain First Aid"
7. Enter your username and password
8. Click the "Repair" button
The second option is to completely delete your keychain then recreate it. This routine is useful if your keychain appears to be corrupt or otherwise inaccessible. This can be accomplished as follows:
1. Launch Keychain Access (located in Applications/Utilities)
2. Click "Show Keychains" in the lower-left corner of the window.
3. Select the problematic keychain from the left-hand pane.
4. Navigate to the "File" menu and select "Delete Keychain '(name of keychain)'"
5. Check all options for deletion and press "OK"
6. Create a new keychain by going to the "File" menu, then "New" and selecting
"New Keychain"
7. You can now make this keychain your default if you desire by selecting it, then
going to the "File" menu and selecting "Make '(name of keychain)' Default"
Login as root and perform repair In some cases, problems with keychains can only be resolved when logged in as the root user.
First, you want to enable the root user:
1. OS X Mountain Lion: Enable and disable the root user
2. OS X Lion: Enable and disable the root user
3. Mac OS X 10.6: Enabling the root user
4. Enabling and using the "root" user in Mac OS X
After enabling the root user, and logging in under this account, again open Keychain Access. First attempt repairs using Keychain First Aid, and failing that, delete then recreate the keychain as described above while logged in as root.
Persistently asked for stored passwords If you are persistently asked for passwords in various applications that you have specified should be remembered in a keychain, your "login" keychain may not be active for one reason or another.
Navigate to ~/Library/Keychains/ (this is the Library folder inside your user's home folder). Find the file named "login.keychain" and double-click it.
Failing that, select the "login" keychain within the Keychain Access application and make sure it is the default keychain by going to the "File" menu and selecting "Make 'Login' Default"
Turn off Keychain synchronization in applications having problems If specific applications are experiencing issues when accessing password-protected material, the Keychain may be to blame.
The above comes from an article published on MacFixit.com.

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

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 stuck at gray screen when booting

Hi - My 2011 iMac with 10.8.2 is stuck on the gray screen when rebooting. I was in Windows 7 bootcamp, and restarted to OS X. I see the screen below, and once the progress bar reaches 100%, the computer shuts off. Every time I reboot, the same problem. I've disconnected everything, except for the standard bluetooth wireless keyboard. I've tried some various boot options, such as holding down Shift while rebooting, as well as command+R, but neither had any impact, it is the same problem over and over. Any tips on what to try next?

If you want to preserve the data on the internal drive(s), you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data, you can skip this step.
There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
1. Boot into Recovery (command-R at startup) or from a local Time Machine backup volume (option key at startup.) Launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
2. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
How to use and troubleshoot FireWire target disk mode
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

IMac has empty blue screen on waking from sleep

My iMac goes to a blue empty screen when waking from sleep. No login. No desktop shows up. Any ideas or explanations? I am working on clearing off hard drive space - currently about 100GB available on 1TB system. But I do not know if that could be a cause.
Thanks for any help you can give.

tritzer wrote:
As far as resetting the SMT, my only option was to hold the power button down and force the system off anyway, since I couldn't see anything.
I did reset the PRAM, which ended up being disastrous! Instead of encountering the problem each time the system went to sleep like what had been happening, after I reset the PRAM, it started doing it immediately during startup. I couldn't even get to the desktop. The computer was completely unusable!
If I hadn't had a spare monitor around, I wouldn't have been able to do anything with my computer! Interestingly, the problem doesn't occur with my old Apple Studio Display, just my new Apple Cinema Display.
You better revert to 10.5.4 and stay with it until this is resolved.

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

Flashing screen when awakening my mac from sleep

Help: What can I do to fix my screen issue-- It flashes for the first 20 seconds each time when I awaken my mac from sleep mode: Thanks!
(mac pro 2007 intel based)

Thanks, Linc. I was worried that since this was a refurbished computer, it was dying again. Makes sense, although alittle annoying that nothing really warns you this is happening. I almost cycled power the first couple times it happened, thinking it was stuck while waking.

My imac freezes , need to restart everytime i wake it from sleep mode. just started happening 2 weeks ago.

For about 2 weeks whenever I return to my imac and tap the mouse to wake it from sleep mode my screen is frozen. I have tried to wait for it to unfreeze but it doesnt wake. I cannot get any results from using the mouse or the keyboard. I always have to hard reset the computer to be able to use computer again. My mac is a year old. Anyone have any thoughts as to why tis is happening? Thanks

If you have more than one user account, these instructions must be carried out as an 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. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left.
Enter "BOOT_TIME" (without the quotes) in the search box. Note the timestamps of those log messages, which refer to the times when the system was booted. Now clear the search box and scroll back in the log to the last boot time when you had the problem. Post the messages logged before the boot, while the system was unresponsive or was failing to shut down. Please include the BOOT_TIME message at the end of the log extract.
Post the log text, please, not a screenshot. If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message. When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into a message.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.
Step 2
Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

Computer crashes when trying to awake from sleep mode

Hi, the last few days when I'm trying to awake my computer from sleep mode I can't do it from the keyboard (as set by me). When I push the power button the computer awakes from an unexpected shutdown.
Looking in the Event Viewer I see it logs the critical Kernel-Power event when the computer awakes from the shutdown.
The Kernel-Power log:
System
Provider
Name]
Microsoft-Windows-Kernel-Power
Guid]
{331C3B3A-2005-44C2-AC5E-77220C37D6B4}
EventID
41
Version
2
Level
1
Task
63
Opcode
0
Keywords
0x8000000000000002
TimeCreated
SystemTime]
2014-06-03T20:51:48.583628200Z
EventRecordID
770654
Correlation
Execution
ProcessID]
4
ThreadID]
8
Channel
System
Computer
Gil-PC
Security
UserID]
S-1-5-18
EventData
BugcheckCode
0
BugcheckParameter1
0x0
BugcheckParameter2
0x0
BugcheckParameter3
0x0
BugcheckParameter4
0x0
SleepInProgress
true
PowerButtonTimestamp
130463022411335780
The EventLog previous:
System
Provider
Name]
EventLog
EventID
6008
Qualifiers]
32768
Level
2
Task
0
Keywords
0x80000000000000
TimeCreated
SystemTime]
2014-06-03T20:52:08.000000000Z
EventRecordID
770649
Channel
System
Computer
Gil-PC
Security
EventData
23:50:08
‎03/‎06/‎2014
870
DE07060002000300170032000800C501DE07060002000300140032000800C501600900003C000000010000006009000000000000B00400000100000000000000
Binary data:
In Words
0000: 000607DE 00030002 00320017 01C50008
0008: 000607DE 00030002 00320014 01C50008
0010: 00000960 0000003C
00000001 00000960
0018: 00000000 000004B0 00000001 00000000
In Bytes
0000: DE 07 06 00 02 00 03 00
Þ.......
0008: 17 00 32 00 08 00 C5 01   ..2...Å.
0010: DE 07 06 00 02 00
03 00   Þ.......
0018: 14 00 32 00 08 00 C5 01   ..2...Å.
0020: 60 09 00
00 3C 00 00 00   `...<...
0028: 01 00 00 00 60 09 00 00
....`...
0030: 00 00 00 00 B0 04 00 00   ....°...
0038: 01 00 00 00 00 00
00 00   ........
Thanks,
Gil

We do need the actual DMP file as they contain the only record of the sequence of events leading up to the crash, what drivers were loaded, and what was responsible.
We prefer at least 2 DMP files to spot trends and confirm the cause.
Please follow our instructions for finding and uploading the files we need to help you fix your computer. They can be found here
If you have any questions about the procedure please ask
If you are using Blue screen view, who crashed, or a similar application, don't. They are wrong at least as often as they are correct
Wanikiya and Dyami--Team Zigzag

My 24" iMac has a gray screen then blue can it be fixed?

When trying to start my imac it has a grey screen and keeps acting like its booting and suddenly changes to a blue screen completely blank help? Can it be repaired or is it a waste of time?

the blue screen is a screen between the boot screen and the Finder starting. While many things cause this, including hardware failures, you will probably have luck reinstalling the OS. Which OS are you using?

IMac Flat Panel Gray Screen when I Turn On

My iMac won't load. When I turn it on there is the "chime" then nothing but a gray screen. I tried reseting the PMU, but still nothing. The machine froze while doing a backup and my hubby forced the machine off. When I tried to turn on the next day, this is what I got. Have tried starting it with everything unplugged... I am in the USVI and there are no Apple people here so I really need some HELP!

Since the problem seems to have started with the forced shutdown, try repairing the hard drive following the steps in Trav's Tips
You can also review this Apple KB Article
Try repairing the disk first and see if that does the trick.
Good luck (although since you're in the VI's your luck seems to be pretty good!)
Clint

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).

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

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