Monitor Flickers when waking up

Whenever my unit wakes back up from sleeping, the display will come on, go off for 1-2 seconds, and come back on. This just started happening in the past week. I've had it for about 3 months now and I keep it on almost all the time, but it's sleeping for most of the day.

That should not happen.
If that behavior started without cause or any coincidental activity, what was the result of running the Apple Hardware Test, located on your Install Disc 1?
While you still have phone support, you might want to call Apple to see if they know anything about this behavior.
Edit-
Perhaps the SMC reset would help.

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HP2509m monitor flickers when waking up

Recently my HP 2509m monitor has begun flickering when it is coming our of sleep mode. Today it flickered a bit on start up.
1. Product Name and Number - HP 2509m
2. Operating System installed - WIN7
3. Error message - none
4. Any changes made to your system before the issue occurred - none

Hi,
Check the cable connections and make sure that they are tight.
Try a different monitor and cable to separate the monitor and cable from a possible PC issue. Alternatively, try the monitor and cable on a different PC.
Does the monitor behave the same way when it is has warmed up?
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External monitor flickers when waking up from sleep

I use an external monitor with my new MacBook. All works well, but I have noticed that if I start using the external after the screen has gone to sleep, I sometimes get a problem on the external where the screen flickers and breaks up. If I disconnect and reconnect the Mini DisplayPort then the problem resolves, has anyone else seen this?
Tony

I have the same issue with my new macbook.
When i wake the computer from a partial sleep the screen flickers and i get line distortion through the image.
If i put the machine to sleep unplug the mini dvi adapter and replug it in and wake the computer up the problem disappears.
The issue is also intermittent doing about 3 times out of every 10 wake ups...
If anyone has any suggestions it would be great, I a using a new Dell 2208WFP monitor.

Monitor flickers when screen saver runs

I have a two monitor setup. I just put in a replacement video card which has one ADC port and one DVI port. The monitor on the ADC port flickers when the screen saver runs. But it doesn't seem to flicker at any other time. The monitor on the DVI port has no problems.
I wonder if there's anything I can do to get rid of the flicker. Could it be the card, which otherwise seems to work fine? Or could it be a memory problems?
Any thoughts appreciated!

I wonder if it is the screen saver. Some really put the 3D graphics hardware to task. Have you tried switching to a screensaver that doesn't demand serious hardware acceleration like "Computer Name" or one of the "canned" savers that display picts like Cosmos, Beach, Paper Shadows, etc?
I keep two different types of temp monitoring on my Macs so see what programs task the system, One is software and the other is a direct-read remote thermometer (remote sensor tucked in the exhaust port of my Intel iMac). When I run the 3D savers, I can see the temps start to go up.

External monitor flickers when scroll on the google stock chart in Safari

Well, this sounds crazy but this is what is happening to my Retina, 15-inch, Late 2013 Macbook Pro.
I can reproduce it.
1. Go to this page in Safari (Version 7.1 (9537.85.10.17.1)): https://www.google.com/finance?q=LQD&ei=nQQ_VPj1H4ebrAHP6oDYDQ
2. Scroll the page (not the chart)
3. My external monitor starts to flicker.
I use mini display port to DVI to connect to my ASUS VE278.
Any idea? Thanks in advance!

Hi Ziang Song,
Welcome to the Apple Support Community!
I know it can be concerning when your external display is flickering and not functioning as you would expect. In this situation I recommend the troubleshooting steps outlined in the attached article.
Apple computers: Troubleshooting issues with video on internal or external displays
Cheers,
Joe

External Monitor Static When Waking From Sleep

Hello community, did anyone had the disrcibed problem and knows about it?
After waking up from hibernation, display is static an doesn't work on; getting of from thunderbolt and put in after a little bit of time doesn't help.

To everyone experiencing the frustrating "static on display when resuming from sleep", I think I finally got the solution to resolve the problem. Since the most recent versions of OSX are using "TV resolution" to configure digital displays (such as 1080p, 720p...) I thought maybe my mac was trying to "talk" with my displays in a "TV language" so I went in my SyncMaster's display setup and changed a few settings to fix the "miscommunication" between my mac and the displays. Surprise! After many months of frustration, it finally fixed the problem!
Here's what I changed in the SyncMaster's setup menu:
Under "SIZE & POSITION" menu, go to "Image Size" and set to "Screen Fit"
Under "SETUP & RESET" menu (down on the second page with my model), go to "Auto Source" and set to "Manual"
Finally,still under the same "SETUP & RESET" menu page, go to "PC/AV Mode" and set to "AV"
Bingo! Now when the computer wakes up from sleep, the screens are going back on like a charm!
Hope this will help people who had the same issue using MacPro with Samsung SyncMaster displays, worked for me anyways!...
Cheers!

Monitor troubles when waking from sleep

Hi everyone, I have recently purchased an LG Flatron W2254TQ (I know, not an apple display, but this could be an issue with all external monitors). I usually just use the external display and not my MB display (ie. I have it plugged into macbook before I turn it on, turn on the MB then close the display so my desktop is only displayed on the external, then open MB a bit so it does not overheat).
Now, after I turn on Macbook it displays fine for about 10 seconds on the external then the MB seems to go to sleep. When I click my mouse to wake the MB, my login screen appears briefly, then the display goes back to sleep. This happens repeatedly, and sometimes when the login screen appears I see the cursor fly across the screen before the monitor goes back to sleep.
Any ideas on what is causing this?
Thanks!

Is the MacBook plugged into its AC adapter? It needs to be.

DVI monitor fuzzy sometimes when waking from sleep

Hi there,
I have a new Samsung SyncMaster P2350 connected via MiniDisplayPort > DVI adapter. Works great 90% of the time.
I use the monitor primarily as my main and have the MBP lid closed.
Sometimes when waking the MBP by moving the mouse the screen will come back up all fuzzy (much like an old television on no channel). I then turn the monitor off and back on and the picture returns..!
I know this is not the monitor or the adapter itself as a friend came over a few weeks ago with his adapter and we connected the MBP to my Panasonic Plasma and initially had the same problem.
Has anyone else experienced this? The fuzzy colours as mainly made up of purples, blacks and whites.
Thanks,
Brett

The weird thing is that every morning, when I move my mouse to wake the computer, both displays go from black to show the desktop but the second display immediately goes back to black. Unplugging it and plugging it back in eventually works after multiple trys. Restarting the computer sometimes works but not always.
The only other major change to my computer before this started happening is that I installed Leopard.
So far I've tried setting my Macbook Pro not to go to sleep but that didn't change anything.
Should I try setting my displays not to go to sleep either? I haven't tried that because Energy Saver warned me that it could reduce the lifespan of the display.

When waking up from standby, monitors power up but no picture is displayed. HP ENVY Phoenix h9

Product: HP ENVY Phoenix h9 PC Series
Product #: H3Y51AA#BL
Model: h9-1387
OS: Windows 8 64-bit
Monitors: DELL 2407WFPHC x 2
Updated graphics drivers to latest non-beta version.
Hello,
Since purchasing my PC a few months ago, there has been one "display" problem after another. This is the current problem:
When stepping away from my computer, I lock it via Win+L and shortly after my monitors turn off. When returning a short time later, I attempt to wake up (But not really "wake up"... To try and fix previous display problems, I've already disabled hibernation and sleep options) my computer by moving my mouse. This causes the monitors to exit standby and power up, but all that is dispalyed is black screens when I should have been presented with the login screen.
Mouse and keyboard clicks do nothing and I'm stuck at black screens. To continue, I press my PC's power button which causes the hard drives to spin-up and shortly after the computer turns off. I press the power button again and the computer boots to the login screen where once I enter my password, Windows loads and all my programs etc are displayed as they were before I locked my PC.
You can see previous problems I've had listed below, hopefully they will also help you detect the cause of the current problem.
Please help.
Thanks!
Peter
Previous problems that I've had:
1) When waking from hibernation, the computer would not wake monitors from standby leaving no way to login and save work. Hard reboot required. Solution: Disable Windows hibernation features.
2) Error along the lines of "Display driver failed and have recovered". Possible solution: Disabled hardware acceleration in Firefox.
3) When waking from standby, I find my 2 monitors have merged into one, and at a different resolution than normal. Once entering password to login, programs that were on seperate monitors are now on the same monitor. Right-clicking the desktop and selecting "Screen Resolution" -> "Detect" would set the monitors back to normal until the problem occurs again. Possible solution: Updated graphics card driver. Not sure if this problem has been fixed, it may have just been covered up by the new problem mentioned above.
This question was solved.
View Solution.

Hey peterallcdn,
I'm sorry you're running into this resuming from sleep issue. Sometimes services that are trying to resume can cause issues like this. I would suggest trying a clean boot (booting with only essential system services running) and then seeing if it resumes from sleep properly.
Here are the steps to disable non-critical services:
1. Windows + Q to bring up Search
2. Type 'msconfig' and press Enter
3. Click the Services Tab
4. Check the Hide All Microsoft Services box
5. Click the Disable All button
6. Click Apply and Restart
When you restart Windows should only load essential system services, no 3rd party software. Lock the computer and let it go into sleep mode as you usually do and then try to resume from sleep. Let me know what the result of that is.
I have seen other cases where Google Talk or antivirus programs will prevent the computer from resuming properly.

Monitor Blanks in and Out When Waking From Sleep

Since getting my Mac Pro (with Apple installed RAM and NVIDIA GeForce 8800 GT), I've noticed that the screen does not immediately turn on when waking from sleep, as my older Macs did. Rather, it turns on for a split second, goes blank for two seconds, turns on again for a split second, goes off again for a second or more, and then comes on permanently.
This behavior only occurs when waking from sleep; it does not occur when the monitor turns on from the active screen saver.
Is this normal for the MAC Pro with an NVIDIA GeForce 8800 GT? I have a HP w2408h monitor with a DVI to HDMI cable. Everything else works fine, including all video behavior.
Thank you.

Hm. Bluetooth, interesting. Thanks for the idea.
I just opened the lid to see about the BT setting and the display didn't go off-on. The BT is off, I'm pretty sure I did that when setting it up as I don't use BT for anything.
I wasn't suspecting anything was seriously wrong, it's just that quick-on feature was highlighted as a selling point and I was curious about the glitch, if it was a setting I could change, for instance like you've highlighted. Annoying when things don't work as advertised.
And if I show the machine off to colleagues and friends, that will be a bad first impression they will want explained.

Blank internal screen when waking with ext monitor connected

I have a 2011 MacBook pro that is connected to a Dell U2410 24" monitor all the time via a DVI adapter.
Most of the time this monitor is switched to a different input - the display port which is connected to my PC.
On the MBP I have display mirrorig enabled.
Usually, when I wake the MBP, I guess it dettect the external monitor (even when that input isnt selected for display) and leaves its own screen blank - which is really annoying as the only way I have found to get the internal display to come alive is diconnect the extermnal display, or switch inputs on my dell monitor so I can see the MBP display and select Detect Display from the screen utility in the system bar.
Is there any setting anyone know of to stop this behaviour and make the MBP allways enable the internal display if the lid is open rather than purely relying upon the external connector when waking to decide what to do?
Just really annoying.
BTW - for all those people who have been complaining about dead MBPs when you wake them and have an external monitor connected - are you sure this isnt what is happening to you? At first I though my MBP had crashed as well - but in fact it just hadnt switched its internal display back on.

Problem solved, with some help (here and here).
Basically, the solution was the installation of a new intel HD 4600 Graphics driver directly from intel.

13.3" macbook pro flickering screen when waking from sleep

I have a Mid 2012 13.3" MacBook Pro (non-Retina) laptop that has been working well, until the last few days. The laptop has had no physical damage and no liquid damage. I have put the laptop to sleep by closing the lid. When the laptop lid is raised and the laptop turns on this last week I have noticed that the screen flickers and then appears to be on, but the screen is a grey color. I have been able to press the power button to put the computer back to sleep. Usually when pressing the power button to wake it from sleep the screen issues have cleared up.
Is there a known issue that may cause the issue with the flickering/grey screen or could there be a short in the wiring that powers the screen?

Hey there Oregan Mac User,
It sounds like you are getting screen flickers when trying to wake your device from sleep. I recommend the troubleshooting form the article named:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
All the best,
Sterling

HP 2010i monitor- Flickering after coming out of hibernation

When I turn the monitor on, or wake the monitor back up after it has gone to sleep, the screen flickers for a minute or so, gradually lessens, then stops flickering. It appears to be the backlight leds flickering around the perimeter of the screen (my guess). It is connected by DVI cable to my tower, the connection seems fine. Monitor is about 3 years old and is out of warranty. Is this something that can be fixed (worth repairing?), or is it just dying a slow death and I need to shop for a new one?

Hello @tgantt,
I understand that you get flickering after waking from sleep mode on your computer. I am providing you with some steps you can try below:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
Step 6. Replace the cable connecting the monitor to your computer
If the above steps did not resolve your issue you can try installing the HP 2010i 20-inch Diagonal LCD Monitor Drivers on your computer. If the issue still persists I recommend that you download and install the latest graphic drivers for your computer.
Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

Mac Pro restarts when waking from sleep

Hi everyone.
I just got a brand new Mac Pro (2 x 2.66GHz), and had Apple upgrade the RAM to 2GB (4 x 512MB). My first problem is that the computer always restarts when waking from sleep, which is annoying! I have reset the SMC by unplugging the machine for a minite, but the problem persists. I have also tried sleeping the computer with nothing plugged in except the monitor and keyboard/mouse, but I get the same problem. All software/firmware is fully up to date.
I have also just noticed that the System Profiler states that there is only 1GB RAM in the computer, even though I am sure that it recognised 2GB when I got the machine a fortnight ago (I even have a screen shot of 'about this mac' to prove it!). Can anybody help, or do I need to phone Apple support?
Thanks,
Matthew

I have a similar problem - hard restart when closing the lid to put it to sleep. It looks like there is a bluetooth issue(?), but I'm not sure what to do with it. We don't have any blue tooth devices in our house. From the console log:
Jan 5 14:57:49 Rigpa kernel[0]: System SafeSleep
Jan 5 14:57:49 Rigpa mDNSResponder: Adding browse domain local.
Jan 5 14:57:49 Rigpa kernel[0]: hibernatepage_listsetall start
Jan 5 14:57:49 Rigpa kernel[0]: hibernatepage_listsetall time: 51 ms
Jan 5 14:57:49 Rigpa kernel[0]: pages 93229, wire 29477, act 34496, inact 2520, zf 1141, could discard act 9830 inact 15765
Jan 5 14:57:49 Rigpa kernel[0]: hibernatepage_listsetall found pageCount 93229
Jan 5 14:57:49 Rigpa kernel[0]: IOHibernatePollerOpen, mlget_interruptsenabled 0
Jan 5 14:57:49 Rigpa kernel[0]: IOHibernatePollerOpen(0)
Jan 5 14:57:49 Rigpa kernel[0]: writing 92989 pages
Jan 5 14:57:49 Rigpa kernel[0]: image1Size 41692160
Jan 5 14:57:49 Rigpa kernel[0]: all time: 5774 ms, comp time: 437 ms, deco time: 0 ms,
Jan 5 14:57:49 Rigpa kernel[0]: image 159194624, uncompressed 276045824 (67394), compressed 158654492 (57%), sum1 529d572d, sum2 c6e9eed5
Jan 5 14:57:49 Rigpa kernel[0]: hibernatewriteimage done(0)
Jan 5 14:57:49 Rigpa kernel[0]: sleep
Jan 5 14:57:49 Rigpa kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Jan 5 14:57:49 Rigpa kernel[0]: Started CPU 01
Jan 5 14:57:49 Rigpa kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Jan 5 14:57:49 Rigpa kernel[0]: System Wake
Jan 5 14:57:52 Rigpa mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Jan 5 14:57:53 Rigpa configd35: posting notification com.apple.system.config.network_change
Jan 5 14:57:53 Rigpa lookupd185: lookupd (version 369.6) starting - Sat Jan 5 14:57:53 2008

Detect display when waking from sleep?

Is there any way to force the display detection when waking from sleep? I find that if the mini wakes before the monitor is on, i get a blank screen. When the monitor is on before waking, everything is normal.
I have the DVI-Detective, and the problem is actually worse when using it -- nothing is detected when waking up, no matter if the display is on or not.
My specs:
OS 10.5
C2D, 2Ghz - 2GB RAM
Sharp Aquos 52inch
All standard HD resolutions work fine - it's just now a matter if figuring out how to force the mini to detect the display...
Surely there must be a way to do this?

Great that you got it working. It seems what is happening when the TV is switched off is that the Mac can no longer see the EDID data. Basically, it's the same as if a hot-unplug event had occurred from OS X's perspective. The mini thinks the TV's video cable has been unplugged, so it thinks it is running headless, which of course it is not. And for some reason not completely clear to me, when the TV's power is restored, a hot-replug event is not triggered and the mini still thinks it's running headless. Maybe you are right that it is removed from the list of connected devices for good. But it isn't supposed to work like that.
The DVI Detective is the right tool for the job in cases like this, so it's good you have one and it's good you got it working. I agree it would be nice if there was more override control within OS X for times like this when things go wrong. But if more TV and 2nd/3rd tier monitor makers paid more attention to computer plug-and-play, then these things would work right in the first place. Your TV is in violation of the plug-and-play standard because the standard calls for the host (Mac mini in this case) to be able to power the ROM and I2C bus within the TV even if the TV is in a powered down state. Clearly your TV isn't doing this.

Monitor Flickers when waking up

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