IMac display won't wake up

I recently replaced the HD on my iMac Graphite 600mhz G3 and all was well until the other day it wouldn't wake up from sleep ... the light on the on/off button was not pulsing so the HD wasn't asleep. Now the display will not wake up whenever it goes to sleep and I have to restart with the power button every time. Also when I plug my iPod in it crashes from time to time and I get the message to 'restart by pressing on/off switch for 5 seconds' message. Is there a firmware update I need? I zeroed the new drive from the Panther install disc. Or is it something else. Please help!

If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following lines:
reset-nvram
press Return on keyboard
set-defaults
press Return
reset-all
press Return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
Still did'nt work? Might be time to call AppleCare or see an Apple Genius or a technician.
Cheers!
DALE

Similar Messages

Display won't wake up

It's a brand new notebook.I've done nothing on it, other than installing Windows updates and creating recovery disks.I set the "Turn off display after" option to 1Minute.IMPORTANT: I set display brightness all the way to zero, the lowest setting possible, using either the keyboard keys, or the brightness option in Windows.Leave the notebook idle for a minute, the display sleeps like it should (the notebook is set to sleep after 30 minutes, it's only the display that sleeps, the notebook is still awake).Move the mouse, press keys on the keyboard, the screen does not come back up. The computer is still up and running-i can toggle keyboard backlight On/Off using the keys, but the display won't wake up.Press the "Brightness +" button on the keyboard, the display wakes up. This is the only way to wake it up. The other option is to press and hold the power button, force a shut down, and start the computer again.This happens ONLY when "brightess" is set to the lowest level. If brightness is set to even one level above the lowest, the issue cannot be reproduced. Moving the mouse or pressing any key on the keyboard will wake the display up in this situation.Both Intel HD graphics 5500 and GTX 850M drivers are up to date.BIOS is up to date as well.Battery/ Plugged in does not make a difference. If the display brightness is set to lowest, the screen will ALWAYS fail to wake up, irrespective of which power source is in use. What do I do? Please don't tell me it's a minor problem and I have to live with it.There are so many minor problems with this notebook, and all these are adding up to make it a total piece of cr.. My almost 5 years old probook with a second generation core i3 CPU and no discrete GPU, is better than this brand new 5th generation core i7+GeForce GTX notebook. I'm beginning to regret this purchase. I should have gotten another probook. Thought the Envy offers a better "bang for the buck", and now i think this was a huge mistake. Anyway, any idea how i can get this fixed? Looks like a driver problem right? Or is this a hardware problem? Can someone with an Envy notebook try this out and tell me if the issue can be reproduced on their rig? It can't be reproduced on my Probook.Thanks.

Thanks for your reply Avenger Well, I called up HP tech support.The lady took remote control of my notebook and tried numerous things in the registry (regedit).But the issue could not be solved. She then arranged for an on-site support engineer to visit my house.The Engineer showed up right on the next day, and tried the following:- Updated ALL drivers, even the ones which were already up to date!Checked with my desktop monitor, the issue cannot be reproduced on the external monitor- the external monitor will wake up on moving the mouse, but the notebook monitor stayed dim (no backlight).Opened the laptop, took out the display cable, cleaned it with some solution he had, put everything back together- issue not resolved, external monitor wakes up but notebook monitor stayes dimmed. This is not the only problem I was having with the notebook, the other problems are:Battery would stop charging when the notebook is switched OFF, and the charger is turned ON and OFF a couple of times.The battery lock doesn't "click" in place, it slides automatically to the "unlock" position, it's loose.There's a dead pixel on the display. He offered me two choices: 1> Replace motherboard (to solve battery not charging issue), replace chassis (to solve the battery lock issue), and replace display panel (to solve the dim display + dead pixel issue). =======OR======= 2> Return the whole notebook back to HP, and get a new notebook (same model) in exchange. I picked option 2. We shared a cup of coffee, and the tech left (he was very nice and friendly). The next day, I got an email from HP, with a PDF attachment, asking me to take my laptop, along with a hard copy of the email, and payment invoice, to the HP store. HP store took my computer back, but they didn't have a replacement ready, they asked me to come after 7 days to pick up a new notebook (same model). I really loved my Envy. It's a very nice looking laptop. Hope the replacement I get won't have these weird issues. I'll update the thread when I get the replacement. Thanks for your help

Imac display won't power up or stay on when it does

imac display won't power up or stay on when it does

Have you checked the Energy Saver settings? System Preferences / Energy Saver.
If the settings are what you want, you can try this. Change them to anything at all then change them back to what you want. The restart the computer and reset the PRAM.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

IMac/Mavericks won't Wake for Network Access

I just migrated to a 3TB Fusion drive iMac and it will not awaken when the network Apple TV tries to load the iTunes library... on WLAN
Energy Saver/Wake For Network Access is checked
I even UNchecked Put Had Disks To Sleep
Computer Sleep 1 hour /Display Sleep about 5 minutes
This worked before on my previous iMac/1TB/Lion on LAN
Any ideas? (Other than setting Computer Sleep to NEVER)
Is it because I'm on wireless now? :-/ Does "Wake" require a LAN connection?

Hi,
I have the same problem. I have also checked the settings as described.
It is really annoying that if I want to use my new Apple TV to stream from the iMac, I have to go upstairs and wake it up first.
My wireless network is via a Sagem router using Channel 2 and 802.11g.
Generally wireless network access is just fine.
Problem is just that the iMac won't wake from sleeping.
Could any installed software be interfering?
John.

IMac G5 won't wake up

I just got this iMac and for some reason when I put it to sleep, sometimes it won't wake and I have to hold down the power on/off button and then start it up again. Because it doesn't happen everytime, I can't figure out why it's doing this. Any help would be much appreciated.

Welcome to Discussions -
Resetting the SMU can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so on. If your computer still exhibits these types of issues even after you've restarted the computer, try resetting the SMU. To reset the SMU on one of these iMacs:
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.

Macbook pro retina display won't wake on windows 8.1

Hi,
I have installed windows 8.1 on my new Macbook Pro with retina with using bootcamp no problem there only issue is after my laptop goes to sleep it won’t wake up. It seems that the issue is with the display driver or something related to it because even when only display is off I have the same problem.

I am aware there are symbols. My technical issue is the MagSafe2 adapter. What people typically do is connect their laptops to the wall when they're battery dies off. No biggie. I can attach it to the outlet. Well, when I connect the adapter to the outlet, nothing happens. Nothing happens at home, at Starbucks, at McDonalds, at other people's home.
When I brought this up with technical support in August when I bought it, technical support person said I might have issues with my electrical wiring at home. I've never had issues with electrical wiring at home because my other Apple products work fine when connected to the outlet. My July 2011 MacBook Pro charged without a hitch.
And I was able to charge my Retina MBP only at night or very early in the morning.
But this weekend, I couldn't charge it at all. I'm starting to think it might be the MagSafe2 adapter problem.
I feel rather ridiculous buying the highest-end of the 15 inch Retina MBP. It cost me over $3000. Right now I'm working with my 5 year old Hewlett Packard laptop. At least my HP works, which can't be said about this top-of-the line Apple product.
Probably explains why Apple stocks are falling. At $3000 I shouldn't be having these type of problems.
Sheeeesh!!!

23" Apple Cinema Display won't wake

I have learned alot on these forums but seldom post. Thanks in advance!
I have a G5 dual 2.0 Powermac, not sure what OS- I should know but honestly haven't updated it in a couple years. It's hooked up to a 23" Apple Cinema Display. I went to turn it on yesterday and the monitor did not come on. The comp appeared to be on, the normal sounds were coming from the machine- the eject button worked, the volume buttons were working, hard drive spinning etc. tried moving the mouse, hit space bar, etc.
The LED light on the front of the monitor is on but no picture. I checked the monitor's manual and tried resetting PRAM, checked connections, made sure there was power to the monitor.
Tried restarting the computer a few times, every time it was the same thing- starts up, normal operating sounds, Mac won't wake up.
Called Applecare, they said the steady "on" light on the monitor indicates that it is not getting a signal. Probably a problem with the Powermac (which is not covered by Applecare). They told me to connect it to a different monitor and see what happens.
I brought in my Dell 22" monitor and same thing happened except for a brief moment "Auto Detect Sleep Mode" flashes on the screen then it goes to sleep.
So it seems that the Powermac is putting the monitor(s) to sleep right away at startup. Anyone know anything I can try?

Hi-
When the LED is "On", the display is "Off".
http://docs.info.apple.com/article.html?artnum=301944
You are sure that no flashing is occurring?
http://docs.info.apple.com/article.html?artnum=88366
Does touching the Power button on the side have any effect?
How did you reset PRAM? Keyboard command?
http://docs.info.apple.com/article.html?artnum=2238
Try resetting the PMU/SMU:
http://docs.info.apple.com/article.html?artnum=86760
Can you boot in Safe Mode? To start up into Safe Mode (to "Safe Boot"), do this:
-Be sure the computer is shut down.
-Press the power button.
-Immediately after you hear the startup tone, press and hold the Shift key.
-Tip: The Shift key should be held as soon as possible after the startup tone but not before.
-Release the Shift key when you see the gray Apple and progress indicator
Can you do a single user boot?
http://docs.info.apple.com/article.html?artnum=106388
Does video display when booting from OS X install disk?
http://docs.info.apple.com/article.html?artnum=300537
Reseating the graphics card may be worth a try.
G4AGP(450)Sawtooth, 2ghz PowerLogix, 2gbRAM, 300gbSATA+160gbATA, ATI Radeon 9800 Mac OS X (10.4.8) Pioneer DVR-109, ExtHD 160gb x2, 23"Cinema Display, Ratoc USB2.0, Nikon Coolscan

MB470LL/A display won't wake up after stand by (periodically)

Hi all,
problem is with wake-up procedure on my laptop. From time to time (not more often than once per two weeks) my MPB won't wake up when I open the display frame. At this point as I see the ambient light sensor also doesn't work, plus I can't turn keyboard lights on. All what I can see is a blank (black) screen, but the display lamp is working well, so some kind oа a signal is coming from video chip. I believe there are a software problem only. Once I decide to leave my laptop alone for a 20 minutes and after that I have seen the desktop, but overall performance was really bad (slow response for any movement such a mouse pointer movement, opening windows etc.) and I was forced to restart MPB. Any suggestions?
PS Forgive me for my ugly English

pls check
http://discussions.apple.com/thread.jspa?threadID=2397576&tstart=0
it seems to me that you share these symptoms.

IMac G3 won't wake from sleep?

I have a iMac G3 500Mhz computer with 128Mb of ram and just recently added another 512Mb chip. My question is that my mac won't wake from a sleep, and when it is restarted it always goes to the disk aid whether the computer was shut down properly or not and that takes for ever. It never use to take so long. I also noticed that in some website, yahoo for instence it hangs while I try to receive my email. I have tryed to zap the pram I reconfigured my desktop I've fist aided it and it say's everythings fine. What could my problem be? I live in newfoundland and no one here know anything about macs. I had a guy over to try to fix an earlier problem but I think he made it worse. He uploaded a version of osx and I had os 9.1 but I couldn't retrieve any of my old files because it wouldn't classic share so I had to redo os 9.1 over everything. Could I have messed something up in the process to make my computer do all these funny things?

You should be able to get it from electronics stores (and probably from mega-computer stores) or from Radio Shack type stores. If they are charging more than $10, an online order may be cheaper even if there is a shipping charge. I have bought these batteries here with good results.
http://eshop.macsales.com/Item_Specials.cfm?ID=2524&Item=NWTBAA36VPRAM
I don't have your type of iMac CRT, but it should be an easy replacement. You can find instructions online, or just ask here...
This article below lists things that are stored in PRAM, but people here have describe many different issues that where related to a weak or dead PRAM battery. Many had to do with startup issues.
http://docs.info.apple.com/article.html?artnum=2238

Imac (2010) won't wake up after installing yosemite

blue screen, with lots of disk activity but won't wake without a hard restart. This is rough on the system (or will need to turn off sleep mode). Is there a fix for this that anyone knows of, or must we wait for an update? don't have the problem with my macbook air (2011) - thx

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 (some of it is hidden by disclosure triangles) 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.
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
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. Click Utilities, then Console in the icon grid.
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.
Step 5
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.

New iMac display won't sleep?

Hi, new iMac 24", 10.5.7, set screen saver at 5 minutes, and display to sleep at 10 minutes. Screen saver works, but it will not sleep. I've changed the setting, and rebooted, still no luck.
I tried everything from suggestions, with no help. I found that if I turn off "screen sharing" in system preferences, it will sleep the display for whatever minutes I set. I have to leave "screen sharing" on because I have flat screen tv hooked up to watch video files on, and I use iPhone app to control screen, to hit play and pause, etc. It is set up with a password, and only my iPhone is used when I am watching something. Why should screen sharing stop display from sleeping? I've left screen sharing on since I got this, so I can remotely log in with "back to my mac" from the road, and it never stopped the display from sleeping before? I shouldn't have to turn off screen sharing just to sleep the display? Am I missing something?

This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Allan Jones says "sometimes there is Network activity: launch System Preferences > Energy Saver > "Options" tab and uncheck "Wake for Ethernet network administrator access."
Good Luck!  DALE

Cinema Display won't wake from sleep

After reading lots in the forums I've concluded lots of people have the same problem that we are mistakenly thinking is specific to a particular monitor or Mac or behaviour.
Problem: Display suddenly does not wake from sleep - incidentally after an OS update and Cuda update.
Hypothesis: This definitely seems like a software problem as I've solved it in so many new ways. (Some people are replacing hardware!) Once fixed, the problem recurs the next time the display goes to sleep. However solutions rarely work a second time.
Solutions:
1. Zapping PRAM fixes it.
2. Deleting all displays preferences fixes it.
3. Safe boot and clear caches may have fixed it.
4. Pulling the Mini DisplayPort cable and blowing on it has fixed it. (I thought it was dusty since it worked. It may have just been pulling the cable.)
5. Deleting a power management preference in System/Library/SystemConfiguration/ fixed it.
6. Moving the power plug from one slot on a power bar to another fixed it. (***!?!)
7. Creating a new user account fixed it.
8. Now I'm stuck.
Please can help me think of a new way to fix it? If I can get it going again, I will simply keep the computer and 2nd display awake forever.

I have a new fix!
8. Launch Magic Bullet Looks app and fiddle with the display settings!!! Woohoo! I got it back again.
As long as the display never goes to sleep and is never unplugged (tried that) I can keep using the monitor. Sadly this means never lettting the new iMac sleep.

IMac display won't stay asleep while encoding with iDVD

My iMac's display refuses to stay in sleep mode while I am encoding a project in iDVD. (Note that I'm referring to sleeping the display, not the entire computer.) I encode large projects overnight, and I am concerned about possible burn-in, the annoyance of the unwanted light when I'm trying to sleep, and the waste of energy. A search of the archives reveals a long history of the same problem which unfortunately has remained unsolved.
I have tried the following with no success:
1. Ruled out accidental mouse/keyboard strokes as the problem
2. Used Hot Corners to initiate sleep (wakes back up after 5 seconds)
3. Setting the sleep display timer to 1 minute in the Energy Saving settings
4. 3rd party app and widget "Sleep Display" (only works for 10.4 Tiger apparently)
Does anyone have any new ideas about this bug/problem? Does it only affect iMacs?
Thanks

rfarwell5 wrote:
there is no activity besides the encoding that is waking up the monitor. I
How can you be sure? It may be some system operation that's doing it.
This may also prevent the display from sleeping, but the next time you're doing this you might launch Activity Monitor and order the process list by CPU. Then when the display wakes up, note what processes (besides the DVD encoding software) are using non-trivial amounts of CPU time.

Windows 7 on iMac (BootCamp) won't wake up

I have Windows 7 (32-bit) installed via BootCamp on my iMac Mac OS X 10.6.3. When Windows goes to sleep, it will not wake up. I have to restart the machine & W7 then "resumes". I saw another thread pertaining to his on a notebook, but the driver fix suggested seems to not apply to this desktop. Thanks.

Did you install the Apple drivers once Windows was up and running?
Those are necessary.
Alter the power options then. Disable hibernation for now.

IMac display won't sleep with hot corner

I saw that this question was asked before but no answer was given. I got my iMac OS X Yosemite 10.10 brand new yesterday. I set up hot corners so that the display will go to sleep when I swipe it. However, no matter how carefully I swipe, it always comes right back on. I cannot get the display to sleep.
What am I doing wrong? Your advice would be appreciated.

You have 90 days of free telephone support with AppleCare, you can get started by clicking Contact Apple for support and service - Apple Support

IMac display won't wake up

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