Screen Flashing/Flickering??

I've had my iMac for about 3 years now. I never had any problems with it until recently. The screen now flashes/flickers constantly. It will darken for a second and then lighten back up. Has anyone else had this issue? Any ideas on how to fix it?

I had a similar issue with my iMac recently. It display would randomly flicker and darken (as if it went down a few brightness levels) and then it would return to normal brightness.
I reset the PRAM and SMC and ruled out it was software related by booting to a fresh OS but the problem persisted. I ended up taking it to the Apple Store and they ended up replacing the LCD panel. Problem has not returned since the repair. Luckily it was covered under warranty.

Similar Messages

Screen flashes/flickers white while working

Hey,
since the upgrade of my Macbook Pro to Yosemite i noticed that the viewport of Photoshop flashes white while working.
This happens while moving stuff around or moving around with the spacebar and on some other occasions.
I have the latest Photoshop CC and a fully updated Yosemite 10.10.1. I could not find any solution anywhere.
tips?

Hmm, actually it was turned off. And every time i turned it back on it didn't save it on the next startup.
I have Reinstalled photoshop and turned Use Graphics Processor on. Works smooth so far.
So my Cpu caused that white flickering? Because it seems like it just happened while not using my gpu.(so far)

Screen flashes or flickers when scrolling

When scrolling through web pages, my screen flashes or flickers. Turns white and then the page displays. Not a major issue, just more of an annoyance than anything. I have turned my phone off twice to see if that helps and doesn’t seem to change anything. Any ideas?

Hi All,
I just got back my iPad after diagnosis from apple care. They have said it's a software issue and nothing related to hardware. Moreover, I checked a few iPads on display at an apple store and still found the same issue.
Cheers,
Mahesh

My macbook pro no longer connects to my tv through HDMI my computer screen flashes blue but my tv does nothing! could someone please help!!

HI i was just wondering if anyone could help me!!
i have a macbook pro and i have connected it many times to my toshiba tv through my HDMI cable, and for some reason now when i plug it into my laptop the screen flashes blue on my laptop but nothing happens to the tv it just says no signal and i dont know what to do!!
if anyone could help that would be fab!!
pretty pretty please!!

Hello ,
Thanks for using Apple Support Communities.
Please follow the steps below to troubleshoot having no display on the external display.
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
Try unplugging the video adapter or cable and then plug it back in.
If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).
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.
Apple computers: Troubleshooting issues with video on internal or external displays
Take care,
Alex H.

IPhone screen flashing white/black/blue

I have a 64GB iPhone 6 Plus, the phone is running the most recent version of iOS 8.
I didn't drop the phone, get it wet or anything. All of sudden the screen started flashing black and white, and blue. I can still send receive texts, calls etc, sound is working fine. I just can't interact with the screen because it's flashing colors. It is very similar to the problem experienced by the user in this thread: iphone 6 plus screen flashing white and black
I've already rebooted the device and tried plugging it into a computer (it wont recognize the phone because I've never plugged it into the computer before).
I'm on vacation, at a wedding and I don't have access to an Apple Store. Is there ANYTHING I can do to get my phone to working order?

Thanks for that info. I restore the phone without any data In the end (as a new device). In order to make the problem go away I had to:
1. enter DFU
2. Update device
3. Restore device
4. Setup as a new device
It didn't work without completing all 4 of the steps. after setting it up as a new device it still flickered a bunch and the color were funny. Especially when looking at high definition photos. It was like it was threatening to start flashing black and white again. I turned the phone off for a while and then when I turned it back on it was fine. It's been fine since then. well see what hapPens.

Periodic screen flash

When my iPhone 3G is on standby (screen off), it flickers ever so lightly every few minutes or so. It looks like it might be network-handshake related?
Also, the flicker is never noticeable when looking straight at the screen. Rather, it's visible when the iPhone is at an angle.
I started noticing this after having to put my phone in silent mode while in the office. Thinking that I was seeing my screen light up due to a call, it turned out to be the screen flashing, like a quick screen refresh.
Not an issue, just curious is all.

Try the standard fixes:
- Reset. Nothing will be lost.
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup
- Restore to factory defaults/new iPod
If you still have the problem thne it ilikely due to a hardware problem and an appointment a the Genius Bar of an Apple store is in order.

HT5242 Since installing this update today, screen flashing has increased dramatically; just wondering if anyone else has this problem and, is there a way to remove an update?

Since installing this update today, screen flashing has increased dramatically. Anyone else has this problem and is there a way to remove a software update?

I just had random letters flash like i was typing them but they didnt show up in the typed section. So weird, bad thing is that I didnt have the original keyboard flickering problem but updated anyway cause Im a fool i guess. It only happened while writing an email n was only the letters U n G.

My MacBook was acting weird so I restarted it and when I login a white screen flashes and goes back to the login page. Help?

My MacBook was acting weird like sometimes I would log on and I wouldn't be able to type my password for a couple seconds,but it usually logged in after that. Then I left my computer open after installing the recent update after that all my applications were not responding. So I shut it down, when I turned it back on about an hour later it went to this loading screen and then to the login like usual. After I tried logging in a white screen flashed and it went back to the login/ password screen like nothing happened. Any ideas on what happened and what I can do to fix it?

Reinstall OS X;
Reinstalling Lion/Mountain Lion Without Erasing the 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 the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

When I turn on or restart my Macbook Pro Retina 15", my entire screen flashes completely bright yellow for a few seconds and then it goes to the normal Welcome screen. How do I fix this??

Hi Everyone,
This problem just started today. When I turn on or restart my Macbook Pro Retina 15" (Mid 2012 version), my screen is light gray like normal, and then after a few seconds my entire screen flashes completely bright yellow for a few seconds, and then it goes to the normal Welcome screen (where I choose to login as myself or a guest user). This suddenly started today and has not stopped since. This keeps happening every single time I turn on or restart my computer.
Yesterday I installed all the Mavericks and other updates that were available in the App Store, so I'm wondering if this is related to that since this never happened prior to my doing those updates yesterday. When I first installed the new OS X Mavericks (10.9.3) update, it went through the whole installation process (took about 10 minutes), and then during the installation I got an error message saying that it couldn't verify my iTunes application that was on my laptop, and then my laptop finished installing the updates. Then once my laptop restarted, the App Store "Updates" section said that I had to do the whole OS X Mavericks (10.9.3) and iTunes (Version 11.2) updates all over again. So my laptop did the whole installation again (took about 10 minutes, but this time I didn't get that "iTunes error message" during the installation process).
Now, when I go to the App Store "Updates" section, it says the following under "Updates Installed in the Last 30 days":
-Digital Camera RAW Compatibility Update (Version 5.05) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-Security Update 2014-002 (Version 1.0) installed April 22, 2014
I'm wondering if this flashing bright yellow screen upon bootup is related to the fact that my laptop installed the OS X Update and the iTunes Update two times each? Or is this new problem totally unrelated? It's just that this problem started a day after these 2 updates were installed twice.
My Macbook Pro Retina 15" (Mid 2012 version) is otherwise working fine at least as of now. The only issue so far is this flashing bright yellow screen every time I turn on or restart my computer.
If anyone could please help me fix this so that my bootup screen doesn't flash completely bright yellow anymore, I would be forever grateful!
Thank you so much for reading this and for any help you can provide.
hope everyone is well,
Elaine

Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / 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.
I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process. Since I did that, my MBP boots up just like normal. No flashing yellow screen anymore!!
(Note that I arrived at this solution when I first saw this page: http://support.apple.com/kb/TS2570?viewlocale=en_US)
Let me know if this works for you!
Elaine

I have a 60 inch Sony XBR TV that has DVI input but not HDMI. I am using an adapter to get the video from my Apple TV, but the screen flashes a lot. Do I have any other choices other than buying a new TV?

I have a 60 inch Sony XBR TV that has DVI input but not HDMI. I am using an adapter to get the video from my Apple TV to the Sony, but the screen flashes a lot. Do I have any other choices other than buying a new TV?

Is this an iphone question?
You have posted in the iphone forum.

Screen flashing between grey and background, dock not showing

I don't know how this happened, but I recently upgraded to Mountain Lion: as soon as I'd logged in, the Dock dissapeared, and the background started flashing between grey and my background. The only way for me to open anything is through Spotlight.
Whenever I try to make an app fullscreen, it glitches halfway through: half the screen is grey, and half the screen flashing. Opening Notification Centre flashes between grey and open and background and closed. Mission Control won't open, and CMD-tab fails to do anything.
Upon inspection in Activity Monitor, there is an abnormal amount of processes named "com.apple.dock.extra": closing them does nothing. One process exists and then doesn't in time to the background flash, and the amount of "dock.extra"s grows and shrinks from 3 to 10.
Can anyone help me with this strange problem?

Open Spotlight and type Terminal. Select the Terminal application.
Type 'sudo rm -rf ~/Library/Dock'. Ensure it looks exactly like that (minus the quotes) and hit enter. Type your password if you have one. Then, type the command 'killall Dock' and hit enter. The dock will terminate and restart, and it will hopefully be returned to its previous state.

I have a 16GB iPhone 3G and my screen will not work. When I have my sim card inserted into the phone calls go through, but I take it out and they don't go through. It was fine one minute and then the screen flashed and now it will not work. any answers?

I own a 16GB iPhone 3G. My father passed it down to me a year ago after he got the iPhone 4. I pressed the sleep/wake button on the top of the iPhone to check the time, and as I did so, the screen flashed on and off and now the screen won't work. Whenever I put my simcard in there calls will go through but I am unable to hear them, but if I take it out calls don't go through. I've tried charging it for a while, connecting to my laptop, holding the sleep/wake button and the home button for 10seconds to restore it, but nothing works. I've looked around and no-one'ed seemed to have this problem. I'd like to know what is wrong with my iPhone ASAP. thanks.

First, update iTunes, then connect the phone to the computer and do a restore. This will also get your iOS up to date. Your phone should operate correctly after doing this, if not, you will most likely need to have the phone serviced or replaced.

Macbook pro screen freezing/flickering peripheral failure

Hey guys
I use my Macbook Pro both at home for music production and live as an instrument. Recently I have been having problems, but for some reason these have never materialised at home - only in the live situation. I shall try to give as much info as possible, but I'm no use with Macs having been raised with windows machines.
Mac OS X 10.6.8
2.5 GHz Intel Core 2 Duo
4GB 667 MHz DDR2 SDRAM
I have around 13GB free HD space
It is second hand and therefore I have no idea about warranty. I have had the machine for over a year.
I THINK it's a 2008 17" model, although I am not sure.
Peripherals at home:
Digidesign Mbox 2 - USB
USB Mouse (third party)
M audio Oxygen 8 V2 keyboard - USB
HD TV as a second screen - DVI - VGA adapter
Live:
Novation Nio 2|4 uadio interface - USB
Novation Launchpad - USB
M audio Oxygen 8 V2 - USB
(Software wise I a running ableton 8 suite with izotope stutter edit. I average about 6% cpu usage)
Recently, my audio interfaces have begun to fail, but only in the live environment. I can switch the Mbox for the Nio at home and there are no problems whatsoever. 2 shows in a row this had failed, so I made sure to test all the equipment extensively. After 2 days of using the Nio as my soundcard using a different USB cable and slot, I assumed the problem was fixed.
On friday night we were playing a show, and mid set the screen froze with glitchy sections - looked like someone had broken the matrix. The screen began flickering in and out very fast in a strobe like fashion. My peripherals were still working fine, so I continued with the show in the hope that I could just control the session from them. Moments later, the audio failed, ad the system eventually cut out. I attempted to buy time and boot up again, but the same thing happened almost instantly.
Now that i've had a chance to get home and try it out, it has been working for hours at a time until eventually doing the same thing. I have found that most the time my usb mouse will remain responsive, yet I am unable to click on anything. Again, the sound generally keeps working, but one by one the peripherals fail. The screen flickering has only been temporary in the home setting, and does not sustain throughout the failure.
I'm generally poor with electronics, but the general consensus seems to be that it may be some kind of electro magnetism/static/I don't know effecting it live? I have never had a single problem with the machine until now. These failures have occured both running on battery and from mains power.

You may be right that a part of the problem is due to external electro-magnetic interference, but could also be heat build up, and the fact that at home it runs for hours before an issue starts, heat is probably a part of the problem. If you can, stop by an Apple store genius bar and let the techs run some diagnostics, explain what is happening and see if they can isolate the issue. You may want to leave it with them for a few hours and let it sit there and run to see if heat is an issue.

Boots to windows startup screen, flashes blue screen, restarts and repeats

HP ENVY H8-1414 Product #H3Z00AAR
Windows 7 Ultimate 64-bit
Alright, so here is my issue. I turn on my pc and it gets as far as the windows startup screen, flashes a blue screen error for about half of a second and then restarts it self. My HDD is recognized in the bios. Tried a memory test in diagnostics and it passes. Tried a hard disc check and it passes the SMART check but fails the Long DST with a failure ID of 0GF21L-0006LR-WPVX0K-61C703 (no idea if those a zeros or O's)
I've also tried the startup repair but it did nothing. So I removed the hard drive and tried to use it in a different PC but had the same issue so I figured the hard drive went bad. Then I tried formatting a spare hard drive and installed a fresh copy of windows 7 on it, tried it on a different PC and it works just fine. However, when I try to use that hard drive on the HP ENVY I get the exact same problem even though it worked just fine on a differenct pc.
I purchased this PC refurbished about 3 months ago, the warrenty just ended a week ago. There have been no hardware or software changes on it at all. This thing worked flawlessly last night... I locked the computer before bad and I woke up to this. No power outages over night or anything. It just doesn't make any sense.

Here are the specs for your HP ENVY h8-1414 Desktop Computer. According to the specs, this model came from the factory with Windows 8 installed. The "blue screen" and restart are normal for Windows 7, when it encounters an error, unless you have altered the default settings.
The LONG DST failure is indicative that the hard drive has failed or is about to fail. Unless the hard drive is moved to an identical or very similar computer, Windows will encounter a "blue screen. This is true with the original hard drive moving from the h8 computer to the other computer and the test hard drive from the other other computer moving to the h8 computer.
Try placing the "test" hard drive in the h8 computer and installing Windows 7 from a DVD or USB stick. If you have any problems, please post back with full error messages and screen shots. Also indicate what stage of the install Windows 7 was doing tat the time.
Please send KUDOs
Frank
{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
This is a user supported forum. I am a volunteer and I don't work for HP.
HP 15t-j100 (on loan from HP)
HP 13 Split x2 (on loan from HP)
HP Slate8 Pro (on loan from HP)
HP a1632x - Windows 7, 4GB RAM, AMD Radeon HD 6450
HP p6130y - Windows 7, 8GB RAM, AMD Radeon HD 6450
HP p6320y - Windows 7, 8GB RAM, NVIDIA GT 240
HP p7-1026 - Windows 7, 6GB RAM, AMD Radeon HD 6450
HP p6787c - Windows 7, 8GB RAM, NVIDIA GT 240

Screen flashing in Windows 8.1

I've just gotten a refurbished Pavilion 17.3' laptop with Windows 8.1 preinstalled. When I'm in the main window, the screen flashes briefly several times a minute. Except for the momentary blanking, the display is correct. I've also installed kubuntu Linux as a dual boot, and Kubuntu shows no sign of this problem. Since the problem showed up before I installed Kubuntu, I know Kubuntu isn't the cause of it.
I tried downloading and installing a replacement video driver via the HP website, but that didn't make any difference. But it did reveal another puzzle. The webside lists 3 different video drivers, but they all have the same version number, the same date, and the same description (but not the same size). They are found at:
http://support.hp.com/us-en/product/HP-Pavilion-17-f000-Notebook-PC-series/6936220/model/7242189/dri...
Why are they different? And which is the correct one for my computer?

@pwabrahams ,
Hello and thank you for posting on the HP support forums. If each driver is the same file name and same date but have different file sizes. What you will want to do is to download each one and save it to an external memory device.
Once you have the drivers downloaded boot your system into safe mode.
Windows 8 Safe Mode
Now in safe mode uninstall the driver for your video.
When the driver is removed boot back into windows normally and install the driver.
Try all three drivers. If all have the same issue you will need to do a repair. For that you will need to contact HP phone support.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Please let me know how this goes for you.
Thank you again for posting and 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.
D5GR
I work on behalf of HP

Screen Flashing/Flickering??

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