Screen flashes on and off after going to sleep

I get this intermitantly when the iMac goes to sleep, it then starts to flash from on to black to on to black etc about every second and just keeps doing it. Have played with the prefs but no luck other than making it not go to sleep. Any ideas? I searched here and other places but can't see any obvious threads.
Thanks

can't b loose connectors as the old slap on the side doesnt fix it and it is way too regular for mechanical so I reckon software but not sure what. Oh well. If you use the button on the back to put it to sleep it does not do it.

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MB screen flashes on and off...HELP!

Just got a new macbook for my wife. Came from Apple with 2 sticks of 256mb RAM. I added 2 1gb Patriot sticks from Newegg. all seemed well. but now under load, not full load just opening apps, the screen flashes black and then after a few seconds it comes back on. It happens often enough to be annoying.
Here's what I did:
1. Replaced with apple shipped ram.- Doesn't seem to occur, so I figured bad ram...
2. Ran memtest on both stick individually. 3 passes on each stick
3. Reset PMU as advised by AppleCare
Still could be bad ram but...
1. I pulled the two 1gb APPLE RAM sticks from my 17" MBP, still occured.
2. Tried the Patriot 1gb sticks in my MPB, all is fine.
So I don't think it is bad ram?
Any helpers out there? Apple wants to blame 3rd party RAM, but their ram that shipped with my MBP exhibit's the problem too...

My screen was flashing just like yours and failed tonight, 20 days into the purchase. Take it back and get a refund. Don't take another macbook until they get all of these quality control issues worked out. This was my third macbook and I had not been having any problems, but was experiencing the flash. It is starting up in the background and can be used in target disk mode, so the issue is the screen. Return while you can, it will eventually go out completely.

I am having problems with my macbook pro and the dock. About every fourth time I start the computer, the dock flashes on and off, then goes completely off and all I get is the spinning ball with brief moments of the cursor. But the computer locks up.

I am having problems with my macbook pro and the dock. About every fourth time I start the computer, the dock flashes on and off, then goes completely off and all I get is the spinning ball with brief moments of the cursor. But the computer locks up.

Do you have Parallels installed by any chance? There is a known problem that causes symptoms similar to this. You do not need to actually be running Parallels at the time and nothing in ActivityMonitor would point to Parallels. An update corrects the problem:
http://kb.parallels.com/111541

When I start my mac book pro the screen flashes on and off and then a blue color before it open to the log in screen. Sometime a program will shot down buy it's self without me clicking the quit button. Help?!

When I start my mac book pro the screen flashes on and off and then a blue color before it open to the log in screen. Sometime a program will shot down buy it's self without me clicking the quit button. Help?!

If you keep getting a 'red' message it means that the HDD is faulty and will have to be replaced. You will have to format the new HDD in Disk Utility>Erase and then install the OSX and your data from Time Machine.
Ciao.

6700 Classic screen flashing on and off since scre...

I have just changed the LCD screen on my 6700. The new screen works fine whilst the phone is in use, but as soon as the normal standby happens, ie after about 20 seconds, the screen starts to flash on and off. As soon as any of the buttons is pressed the screen stops flashing and is on and back to normal. I have tried resetting to factory default. Tried to update firmware, but the version is 10.50 and is unable to be updated.
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Is it possible that there may be a fault with the screen or ribbon cable, which is strange as the screen work fine and displays all pixels when in use.
Any suggestions as to what can be tried next?

Thanks for speedy reply.
Yes I did change the screen myself as the local approved Nokia Repair Centre would not replace the screen under warranty as they stated that cracked screens are not covered by the Nokia warranty. They then mentioned that they had none in stock anyway and were not placing their next order until 24th October.
I have now put the cracked screen back into the phone and normal operation has been resumed. From this I conclude that although the new screen worked fine when the phone was in use, there is an inbuilt fault that causes the flashing.
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How do i fix my issue: Apple Logo flashes on and off after iphone battery died during IOS update?

I've tried the methods I've seen on youtube and other iphone tech help sites but I am still having the same problem. Today while updating to IOS 7 my iphone 4 battery died and I didnt have a charger, now that I am home an I put in on the charger I notice the apple logo just flashes on and off. I've tried to restores using the DFU mode with the home and power button but that only seem to stop the logo from flashing and even then the iphone still isnt recognised by the pc to restore, Is there any other way i can go about fixing this problem!!!!

You can try the steps recommended in the User Guide. If they don't work bring your phone into Apple for evaluation.
http://manuals.info.apple.com/en_US/iphone_user_guide.pdf

Screen flashes on and off when trying to delete app

I Was trying to delete an app. When i pressed the x in the corner the app and several apps next to it began to flash on and off. The only way i could stop it was to completely shut down the ipad and restart?

DId you try deleting it again once the iPad restarted?
Try a soft reset first, holding down the home & sleep/wake buttons until the Apple logo appears, then let go & let the iPad boot up normally.
Try deleting the app again. If that doesn't work open Settings->General->Usage. Under Storage select Manage Storage. Scroll down the list until you find the app you want to delete. Tap it & select delete.
If neither of those work try Resetting All Settings
General->Reset->Reset All Settings.
If you are still unable to delete the app or if the iPad continues to shut down while trying to do so, then I would try doing a restore using iTunes:
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New Macbook air screen won't wake up after going to sleep - what's this?

When watching a movie on Netflix, for example, since I'm not touching the keyboard, the computer goes to sleep - sort of. The screen fades briefly and if I fail to notice quickly enough to touch a key, the screen goes black. The sound continues, however, and the keyboard is lit. I can't wake the screen back up. I have to restart it.
I've had the computer for less than a week.
What's going on - is my new MacBook Air defective or is there something I can do to stop this annoying glitch from occurring?

There is no need to diagnose such an issue, you just bought it and paid for service and 14 day exchange.
Return it for another unit, others here will concur on that fact.

Logo flashing on and off after ios upgrading..

HI,
What wrong after upgraded my ipod touch ios the apple logo is continous flashing..
Please help me to solve my problem..
Thank you

Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

My screen blinks on and off then goes black

I will be in the middle of something, and they screen will blink off and on again a few times, then go blank. I leave it for a while, then it comes on again. One time it came on but with weird colors. Any ideas?

Not normal. Take it to an Apple Store for evaluation.
Make a Genius Bar Reservation
http://www.apple.com/retail/geniusbar/
 Cheers, Tom

IPhone 5s screen flashes on and off during voice calls?

Operation is perfect with every other app except whenever the phone detects I'm making or receiving a voice call. No problem on facetime.
The screen will instantly black out and to bring it back I have to press the main button, then screen will reappear but only for an instant before blacking out again.
It does not matter if the phone has been in standby or if I've been actively using it as the call comes in.
Its about the most frustrating thing I can imagine.
One clue, while I'm talking the phone will often mute itself as if my cheek activates the mute function.
I use no screen protector but I do use a case, it still does it when I take the phone out though.
It has done this since new and through at least one software update
Any help really appreciated, thanks,

My wife rang Apple and while both of us spoke to Apple on the land line using hands free and spoke to each other using our iPhone 5s we were able to see that my big paws shadowed the proximity sensor each time I moved in to stab a button! Problem solved! I didn't even know there was a proximity sensor and your reply would have led me to it, thanks.

My iphone 5 flashing on and off

my iphone 5 went from stuck into restore setting to errors to now flashing on and off after i tried for hours to restore because of the first issue

Check and make sure you have enough battery life left. If not, this will cause the device to flash off and on. Second you can also make sure assisted touch is on so better assist you with the device multi-touch display.
Multi-Touch Assistaive settings can be adjusted under:
Settings--Accessibility--Assistive Touch Enable to toggle to ON position.
If the battery is not fully charged, plug it into a wall outlet with the proper charger and leave it plugged in until you see a Battery icon displayed on the display, once this is on you may see a little red at the bottom of the battery meaning that your battery was drained. This may also help resolve your issue.

My iPod touch 4 is flashing on and off consistently with the apple logo. This happen after I replaced screen?

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My ipod keeps flashing on and off by itself and goes tto the power off slide message. How do I fix this?

My ipod keeps flashing on and off by itself and goes to the power off slide screen. How can I fix this problem?

Try:
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

MacBook Air is just flashing on and off but not working after trying updates

This morning I got notification that I was supposed to update my MacBook Air with both update for iTunes and update for Firefox.
I hit yes to both.
Now I am just getting a constant flashing on and off and blank screen alternating with brief picture of the Apple with bar underneath it.
Have turned on and off several times and still won't work.
Ideas/

Welcome to the Apple Support Communities
I don't think that the iTunes and Firefox updates could do this, but it looks like the logic board is damaged. What happens when you press Shift key while your Mac is starting?

Screen flashes on and off after going to sleep

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