Screen flickering on iMac (Yosemite) with Safari overload?

I seem to keep getting a problem when I load Safari up as my screen starts to flicker violently with all of it's colours jumbled up, I only have ten tabs open in about five separate windows and I think it pushed the limits of Safari.
I read that it could be an extensions issue but as I've not installed any new ones, nor had any issues with the ones I have, I found that not to be the problem even after disabling them. I also installed the latest Flash, which didn't make any difference either. No, the only thing that stopped the problem was to remove all of the tabs.
I also cleared my Cache and History & Website Data
Extensions:
• Click2Flash
• AdBlock
• delicious
• NoMoreiTunes
• Beautipedia
• TabLinks
My iMac:
Safari Version 8.0.2 (10600.2.5)
OS X 10.10.1 (14B25)
iMac (27-inch, Mid 2011)
2.7 GHz Intel Core i5
16 GB 1333 MHz DDR3
AMD Radeon HD 6770M 512 MB
Screen shot:
http://pbrd.co/17Y3FXz

Hello Hamper,
The article linked below provides a lot of great information and troubleshooting tips that you may not have already tried, which can help you resolve the Safari display issue on your iMac.
Safari 8 (Yosemite): Safari troubleshooting
Cheers,
-Jason

Similar Messages

Has anyone else had screen flickering on iMac 27"?

I bought my 27" iMac only about one week ago, with the i7 processor, 8gb ram and 2gb graphics.
All has been fine, except every now and then the screen will flicker?
It happens every few hours I would say. It's never predictable, just happens and for about 10-20 seconds at a time.
Has anyone else had this issue? I'm waiting for my apple care to register so I can speak to someone about a replacement unit.
But for now I just thought I would ask and see if anyone else has run into this problem?
Thanks.
FD

I have this same problem, Just bought a new imac 27".
When i'm scrolling in websites it's flickering. also when i slide to different desktops.
Is here anybody who can help with this??

Photoshop CS6 - Screen flickering when using brushes with new MacAir 2013

Would the Adobe team please respond to the issues reported by several users:
http://forums.adobe.com/message/5449199
A number of users experience severe screen flicker in Photoshop CS6 when using any of the larger brush type tools (cloning, eraser, brush, spot healing, burning, and dodging). As many on this thread are experiencing, it is awfull and unusable! The flicker is screen wide black boxes, sometimes the whole screen goes black. It only seems to happen when we put the cursor over the image to edit.
Hardware: MacBook Air 13", Haswell 1.7 GHz, 8GB, 512 SSD Software:
Photoshop CS6 v13.1.2 20130105.r.224, OS X v10.8.4 (and perhaps others)
Looks like a CS6 is not compatible with teh new MacAir. Please look into this and advise.
Adobe Photoshop Version: 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00) x64 Operating System: Mac OS 10.8.4 System architecture: Intel CPU Family:6, Model:69, Stepping:1 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading
Message was edited by: GSVAI

An update:
I went to the Apple store and brought myself a more recent MacBook Air (13", 4/256 FYI, they were out of the 8/512 model). I can't reproduce *exactly* what you're showing, but got the flicker to happen by resizing the cursor. Also, while painting, the screen seems to stop updating except for the cursor -- not only is Photoshop unable to draw, but other applications stop drawing as well. And a few times it hasn't even updated the cursor (while all other apps seem frozen). That's not normal.
When I see the flickering, I frequently see the menubar and other UI elements draw at the wrong location on the LCD, then black, then redraw in the correct location -- repeat in different positions and lots of "static" until I stop changing the cursor. That's more evidence of a hardware or and odd driver issue. The odd thing is: it doesn't happen all the time. It's possible that the one we have at the office also shows the problem, but we didn't test long enough.
I'm trying to reach out to my hardware contacts at Apple - but it's a weekend before a holiday, so we may not make progress immediately.
One thing that would be useful here: the model of MacBook Air that you have that shows (or doesn't show) the problem.

Lock screen shows blurred background image with Safari run and volume controls

The normally sharp image in the lock screen is blurred. Run and volume controls for Safari are displayed at the top of the screen - volume slider moves, play button has no effect. I do not know how to return the screen to normal appearance. Wallpaper settings show normal image. There are no active movies or videos running.

OK, I returned to the settings for Wallpaper and Brightness and selected a different Wallpaper - the problem went away. The cause may be that the specific wallpaper I had been using is no longer present for selection.
John

Weird screen pattern freezes iMac, can't boot from HD or DVD

I woke up today to find the screen of my iMac black with a sparse pattern of bright pixels on it. I wasn't able to power down holding the Power buton so I unplugged it and left it for a bit before plugging back in. I was then able reboot without any problems. Then a few hours latter a weird pattern appeared across my screen, kind of rolling, animated in spots as seen here:
I powered down, started it up and the screen had this pattern on it:
It froze during startup at the point shown in the photo with the Apple logo. I powered down, unplugged, plugged back in and then tried booting up from my Snow Leopard install disc. It also froze on the logo screen. Another attempt brought up the "You need to restart your computer…" message in different languages shown here:
I figured it was having a kernel panic so I did some searching around and followed instructions on The X Lab - Resolving Kernel Panics page and Apple's Kernel Panic Troubleshooting page. I unplugged everything but my mouse (wireless keyboard) and tried booting into Safe Mode. The screen still had the same pattern but it froze again during startup, the grey progress bar having disappeared.
I can't boot from my hard drive or from a DVD and the pattern is always on screen when I turn the iMac back on. I can't run Apple Hardware Test. I'm stuck but I'm wondering if anyone knows what the cause might be or has any suggestions on how to fix it or even get it to boot up somehow.
I have TechTool Pro and a large flash drive. I'm going to try creating a bootable USB drive with Snow Leopard on it from this backup computer and try to get TechTool Pro on it as well. I'll report back but I'd really appreciate any feedback on this problem.

Some things to report. First, the night before any of this happened, I noticed the fan was running when there wasn't really any reason for it. The computer was idle, no major tasks running. I'm wondering if perhaps the videocard overheated and is causing problems. Perhaps the temperature sensors are screwed up?
Today I got a USB keyboard hooked up and reset the PRAM. Still unable to boot but the pattern on the screen did change from the mess of b&w squigglies above to vertical bars as shown here:
Trying to boot normally or in Safe Mode both result in the spinning wheel freezing and halting startup.
I found powering down then gets weird. It's like it tries to turn on again but can't after a second. Or sometimes it will and the mouse lights up, I can hear the optical drive but the screen stays dark. At that point I need to unplug and try again.
I tried booting from Snow Leopard install DVD during one of these weird cycles and could hear it trying to access the optical drive but I don't believe it even got to the chime stage.
I attempted booting from the install DVD again after unplugging. No luck there but instead of a frozen spinning wheel, it brings up the "You need to restart message…". Other methods don't do this.
Still at a loss to find a reason for this but it appears to be a hardware problem, no doubt the video card based on the screen issues. Does any of this shed any light on what the problem is or (even better) how to fix it?

Screen flickers with safari version 8.0.2. I'm running Yosemite 10.10.1. Reseted safari, rebooted, etc. Nothing works. Ideas?

Screen flickers with safari version 8.0.2. I'm running Yosemite 10.10.1. Reseted safari, rebooted, etc. Nothing works.
Ideas on how to fix?
The flickering doesn't always happen but does come back after some time of use.

From the Safari menu bar, select
Safari ▹ Preferences... ▹ Extensions
Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.

Yosemite installed on iMac purchased with Mavericks now takes 2 minutes to boot and give the login screen.

Downloaded and installed os x yosemite on iMac that was purchased originally with Mavericks. When power button is pressed I get start up audio tone and then the the black screen with the white apple symbol with the progression bar. The bar moves very slowly two about one third and then the mouse cursor appears and there it stalls for around two minutes. After the wait the login screen appears and it operates normally. This whole process before update would only take maybe 30 seconds.
If I try the web recovery process it will revert back to Mavericks any suggestions on what this might be. I do have an external Mac passport pro external drive that does have time machine enabled and has been there for months.
Thanks

After spending a number of hours with Apple Care personnel I was connected with a supervisor and finally got the iMac to boot up on every attempt and in a reasonable amount of time. Login screen now comes on in 30 to 40 seconds and computer is usable within a total time of 1 minute to 1minute 30 seconds.
Here was the process. Tried to download whole operating system with reinstall from utilities menu at power on and at 7 hours progress bar stalled at one third the way. Reason, time machine external hard drive was still connected during process. Disconnected all external connections except power and tried download again. This time whole operating system downloaded in 15 to 20 minutes. Yosemite installed and rebooted automatically and booted to login screen, signed in then to desktop, but boot took around five minutes. Shutdown and connected all peripherals, i.e.. ext. HD, DVD, printers and tried to start. iMac stalled at 2 minutes into progression bar with white apple symbol before login screen. Removed peripherals and tried again and still stalled and would not boot.
What was done to correct is as follows. Started iMac in Safe Mode, cleared all items in cache from Macintosh HD/Library folder and System /Library folder, system start up items, launch agents, and launch daemons contents cleared, removed printers in system preferences, ran disk utilities verify and repair of disk and disk permissions. Shutdown and removed power from iMac. With no peripherals system then booted normally. Reconnected peripherals while iMac was still on and added printers back to system preferences and all is well.
So it seems only reasonable that the downloading problem was hindered by the time machine external hard drive, to which an Apple rep. agreed and the extremely slow boot up or stalled boot up was caused by items in the start up and launch folders. I will state here that I was using my ISP's anti virus software for the Mac which was in the launch folders and most likely was causing the boot up problems.

I have a late 2009 imac i am having issues with my screen flickering and getting dark

i have a late 2009 imac 21 inch i am having problems with my screen flickering ND GETTING DARK DOES THIS MEAN THAT MY COMPUTER IA FAILING

I have partly the same problem (Sceen blackening) sparodically.
2010 iMAC with I7 CPU and ATI Radeon HD 4850 512 MB Graphics.
If I lower the brightness to around (3 or sometimes 4 of the on screen squares F2) the issue does not happen at all. I prefer a bright screen.
The issue commenced immediately after instaalling OS X 10.8.2 update one year ago.
The current software is OS X 10.9 (13A603)
The graphics on this computer are always first rate when working properly even at maximum brightness
There are particular days and times when the problem routinely occurs.
Some of my neighbors with iMacs have similar problems.
I live adjacent to the City of London in an area where new building seems to be developing faster than the various utilities and there are known Power Network issues. Professional surge supressors make no difference.
I live in a large property with four independent ring mais. The issue is present on all four rings. I have yet to take the computer elsewhere to possibly eliminate power issues from the problem.
I am reluctant to replace an otherwise fine top of range iMac which otherwise serves me well since the same problems might be present.

IMac late 2009, screen blacks out running Yosemite 10.10.2

My iMac's screen blacks out for no apparent reason, and the computer is still running normally. But I can't see it.
I thought temperatures were to blame, resetted fans with Macs fan control to speeds, where everything is nice and cool, the problem persists.
The screen might black out, for no apparent reason while working, or when idle. Trying to restart manually, it might black out while in the login screen, or even the apple logo. Or it might even restart normally and work for 8 hours. I have been trying to leave login items out, even Macs fan control an iStats, and the problem remains.
If I clear PRAM while rebooting, I might get a new lease of working life, but not persistently.
The problem started around two months AFTER I installed yosemite and with no new programs installed at the time.
Please Help.

And an Etrecheck
Problem description:
iMac screen blacks out in yosemite
EtreCheck version: 2.1.8 (121)
Report generated 1April, 2015 at 15:20:46 GMT+3
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    iMac (27-inch, Late 2009) (Technical Specifications)
    iMac - model: iMac10,1
    1 3.06 GHz Intel Core 2 Duo CPU: 2-core
    8 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 0/DIMM1
            2 GB DDR3 1067 MHz ok
        BANK 1/DIMM1
            2 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 4850 - VRAM: 512 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 1:12:55
Disk Information: ℹ️
    Hitachi HDE721010SLA330 disk0 : (1 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 999.21 GB (554.08 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    OPTIARC DVD RW AD-5680H
USB Information: ℹ️
    Logitech USB Receiver
    Apple Inc. Built-in iSight
    Generic USB Storage
    Apple Internal Memory Card Reader
    Microsoft Wired Keyboard 600
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Library/Application Support/Avast/components/fileshield/unsigned
    [loaded]    com.avast.AvastFileShield (2.1.0 - SDK 10.10) [Click for support]
        /Library/Application Support/Avast/components/proxy/unsigned
    [loaded]    com.avast.PacketForwarder (2.0 - SDK 10.10) [Click for support]
        /Library/Extensions
    [loaded]    com.driver.LogJoystick (2.0 - SDK 10.9) [Click for support]
    [loaded]    com.logitech.driver.LogiGamingMouseFilter (1 - SDK 10.8) [Click for support]
        /Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
    [not loaded]    com.roxio.TDIXController (2.0) [Click for support]
Startup Items: ℹ️
    TuxeraNTFSUnmountHelper: Path: /Library/StartupItems/TuxeraNTFSUnmountHelper
    Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.avast.update-agent.plist [Click for support]
    [loaded]    com.avast.userinit.plist [Click for support]
    [running]    com.bjango.istatmenusagent.plist [Click for support]
    [running]    com.bjango.istatmenusnotifications.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.avast.init.plist [Click for support]
    [loaded]    com.avast.uninstall.plist [Click for support]
    [loaded]    com.avast.update.plist [Click for support]
    [running]    com.bjango.istatmenusdaemon.plist [Click for support]
    [running]    com.bombich.ccchelper.plist [Click for support]
    [loaded]    com.torch.update.agent.plist [Click for support]
    [loaded]    net.freemacsoft.LiteIcon.LIHelperTool.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.avast.home.userinit.plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [failed]    com.jdibackup.ZipCloud.autostart.plist [Click for support]
    [loaded]    com.jdibackup.ZipCloud.backupstart.plist [Click for support]
    [failed]    com.jdibackup.ZipCloud.notify.plist [Click for support]
User Login Items: ℹ️
    Macs Fan Control    Application (/Applications/Macs Fan Control.app)
    Dropbox    Application (/Applications/Dropbox.app)
    Logitech Gaming Software    Application Hidden (/Applications/Logitech/Logitech Gaming Software.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Unity Web Player: Version: UnityPlayer version 4.6.1f1 - SDK 10.6 [Click for support]
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
User internet Plug-ins: ℹ️
    RealPlayer Plugin: Version: Unknown [Click for support]
    Google Earth Web Plug-in: Version: 7.1 [Click for support]
Safari Extensions: ℹ️
    AllMyTube
    GMail Counter
    SPOI Options
    Ultimate Status Bar
    SuperDrag
    Stop/Reload Button
    AdBlock
    YoutubeWide
    Magic Scroll
    ZoomBySite
    AllPagesZoom
    ClickToFlash
Audio Plug-ins: ℹ️
    DVCPROHDAudio: Version: 1.3.2
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    Perian [Click for support]
    Tuxera NTFS [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         9%    mds
         5%    WindowServer
         3%    storedownloadd
         3%    MacsFanControl
         2%    com.avast.proxy
Top Processes by Memory: ℹ️
    438 MB    softwareupdated
    292 MB    Safari
    163 MB    com.avast.daemon
    160 MB    com.apple.WebKit.WebContent
    112 MB    iStatMenusDaemon
Virtual Memory Information: ℹ️
    3.28 GB    Free RAM
    3.84 GB    Active RAM
    624 MB    Inactive RAM
    739 MB    Wired RAM
    2.52 GB    Page-ins
    53 MB    Page-outs
Diagnostics Information: ℹ️
    Apr 1, 2015, 02:05:41 PM    Self test - passed
    Apr 1, 2015, 11:51:03 AM    /Library/Logs/DiagnosticReports/com.apple.AmbientDisplayAgent_2015-04-01-115103 _[redacted].crash
    Mar 31, 2015, 04:43:57 PM    /Library/Logs/DiagnosticReports/ntfs-3g_2015-03-31-164357_[redacted].crash
    Mar 31, 2015, 04:39:52 PM    /Library/Logs/DiagnosticReports/ntfs-3g_2015-03-31-163952_[redacted].crash
    Mar 31, 2015, 12:38:13 PM    /Library/Logs/DiagnosticReports/ntfs-3g_2015-03-31-123813_[redacted].crash
    Mar 31, 2015, 04:16:25 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/garcon_2015-03-31-041625_[reda cted].crash
    Mar 31, 2015, 03:06:27 AM    /Library/Logs/DiagnosticReports/com.apple.AmbientDisplayAgent_2015-03-31-030627 _[redacted].crash

MacBook Pro screen flickers and freezes after Snow Leopard/Safari 5 updates

Hi guys,
I have a silver 120GB 15-inch MacBook Pro from Summer 2007 with 3GB RAM and 25+GB free space which has recently begun to freeze irrecoverably. The first appearance of these symptoms seems to coincide with my installing the Snow Leopard 10.6.6 update via Software Update.
I'm not particularly well versed in computer technology, but will try to describe my problem as detailedly as possible.
What happens is this:
1. I start the computer as per usual, with only a couple of startup items. Everything's fine.
2. I start working. Use a lot of Safari 5 for browsing websites, often with some kind of Flash or "Flash-type" content such as banner ads, videos, even full Flash designs. I may also have programs such as QuickTime, VLC or an image editor open, if not necessarily "actively" doing anything. Everything's still fine - I'm able to both browse websites and watch videos as usual.
3. After a while of active working - say, 1-3 hours - I notice browsing websites gets a little choppy. Display features such as the file list view in Finder may or may not appear properly. The rotating wait cursor may or may not appear from time to time.
4. Immediately after symptom no. 3, the next time I start to watch a video, either via Safari 5 (say for example something on DailyMotion.com) or a file via QuickTime, something goes wrong.
Following no. 4, one of three things invariably happen:
5a) The video freezes and the entire screen flickers from black to the screen view very quickly two or three times, after which the computer or screen appears to freeze. The cursor still moves, but nothing reacts to it - open windows become completely unresponsive, nor does the top or any other menu react in any way to clicking. The "menu row" of application items, which normally appears when I move the cursor to the very bottom of the screen, doesn't appear. Restarting "blindly" by pressing the Off-button once and pressing R doesn't work. I'm forced to do a hard reboot, after which the computer is once again fine until the next two hours of active working. This usually happens ONLY when I try to watch a video in Full Screen-mode.
5b) I notice the video freezing only just in time, and am able to pause it and "esc" out of Full Screen-mode, and the computer remains operational. However, as soon as I again try to play video in Full Screen-mode, everything described in 5a. happens.
5c) The video stops playing, and the screen reverts momentarily to pale blue before switching to the login screen. I login again with my details, and everything appears to be fine again until the next two hours of active working. The computer "starts up" a lot faster than with a hard reboot. This usually happens ONLY when I've tried to watch a video in its original size, i.e. when not in Full Screen-mode.
This happens 1-4 times a day, and it appears to depend directly on how much work I've been doing on the computer. The less I use it in the course of a day, the longer it takes until the next time it freezes.
So, in a way, I'm able to replicate this problem. 95% of the time the screen has frozen while watching or starting to watch (usually already when starting to watch) video footage, but it has also frozen a couple of times just switching between e.g. Safari 5 and an image editor or browsing a website with a Flash banner ad or embedded video content (which however hasn't necessarily been playing); today, the screen froze when I tried to open a website made entirely with Flash.
Although it could be just a coincidence, I believe this issue first appeared when I updated Snow Leopard to 10.6.6 via Software Update alongside some other pending updates, including as far as I recall one for Safari 5. The update process appeared to have gone well at the time, though, and was not interrupted in any way. I have never had this specific problem with the computer/screen before, though.
I've read a couple of threads here regarding very similar issues with newer MBP models than mine, in which it has been suggested that the fault may lie in a malfunctioning NVIDIA GeForce graphics card. Now I've had that replaced already once because my screen went unexpectedly completely blank after a forced reboot 1-2 years ago (I don't remember exactly), but according to my System Profiler info the card still a GeForce 8600M GT. Can it be failing again?
I've also had some kind of a RAM card failure once. As far as I understood it, one of the RAM cards had fried and was preventing the computer from starting up. I replaced the bad 1GB card with a new 2GB one and the problem was resolved. Before the computer died, there were also other symptoms, but they were not similar to these.
I'm also doing the Apple Hardware Test tomorrow. Any other suggestions, though, than the graphics card?
*Could this have to do with Flash or Safari 5?* Just hear me out. Even though my computer has frozen from watching a video in just QuickTime, Safari 5 has always been open in the background at the same time, and more likely than not with websites with "Flash" content open. And come to think of it, before I performed the Snow Leopard and Safari 5 updates, I used to have daily problems viewing Flash video in Safari 5, the video content either suddenly showing up as "Plug-in Failure" or crashing the browser; I've had both Safari 5 and the Safari 5 Flash plug-in "quit unexpectedly" countless times in the past, almost daily. Sometimes the "Plug-in Failure" could be fixed just by refreshing the browser view; at other times, Safari 5 would stop showing Flash content altogether - Flash banner ads (such as Google ads), YouTube and other Flash videos, everything - until I quit and restarted Safari 5. BUT - since the day I updated everything via Software Update, I don't remember this happening; it never gets to "Plug-in Failure" now. Could it be worth trying to use e.g. just Firefox for a while or is there something (e.g. Adobe Flash) that I could try reinstall? Or am I just clutching at straws here?
Thanks for reading this long, long post!

Do you have access to an Apple Store? If so, it may be worth making an appointment at the genius bar and having them run the test for the NVIDIA problem. Since your replacement logic board still has the NVIDIA GeForce 8600 M GT video chip, it could be starting to happen to your replacement logic board.
I also agree with all of CMCSK's suggestions. Freezing is often associated with hard drive problems. You might also want to run SMART Utility:
http://www.apple.com/downloads/macosx/systemdiskutilities/smartutility.html
You can download the demo and run it several times for free. It will give you a very comprehensive view of the physical health of your hard drive. If you still have the original one from 2007, it's getting pretty long in the tooth and may be approaching the end of its average useful life of 3-5 years. I just recently had to replace my original 2007 Fujitsu drive.
If your drive is headed south, and is also too small, it may be time to upgrade to a larger and faster drive.
The software update probably didn't cause the problems, but it may have exposed problems that were already in existence.
Good luck!

Issues with Yosemite and Safari on extended monitors

I have Yosemite installed on a Mac Pro with 3 monitors attached to it. As soon as I installed Yosemite, I noticed that whenever I tried to fill in text input fields on a web page, the things I typed in would start blinking. And when trying to backspace to correct any typing errors, the field would remain the same and continue blinking. It was very annoying because it was very difficult to enter anything into text input fields.
My brother and an officemate who also had Yosemite installed on their computers were not experiencing this issue so I tried to isolate the problem on my system. What I discovered is that Safari behaves as it should when it is displayed on my main monitor. But whenever I move the Safari window over to one of the other monitors, any text input field on a web page would be next to impossible to type text into. Other input fields, such as dropdown list boxes, act weird also.
I should add that this only happens with Safari. Firefox and Chrome do not behave this way on any of the monitors. Other apps also run fine on the extended monitors. It's just Safari that misbehaves.
Has anybody else experienced this problem. Is this a known bug? I tried doing a search here in this community and on the internet itself but have not found anybody else complain about this issue.
Thanks.
...Leo

Hi all, I too am expieriencing similar issues.
I am running a 2012 6core 3.33 Mac Pro with two ATI Radeon cards driving 3 27" LCD Cinema Displays. One of the Radeo cards (1) drives the outer 2 screens and the other card (2) drives the centre screen alone.
I upgraded from Mavericks to Yosemite 10.10.01 after being very pleased with it running on my Macbook Pro for a few weeks.
My center screen had issues immediately rendering certain pages in Safari, the App Store and Mail. In particular the google page when it has live search results showing, the App Store updates page also renders badly, and some emails in Mail that are html also don't load as the should. Generally its the top of the page flashing, or the text input box on a page like this thats effected.
I did a fresh install of Yosemite and it didn't fix the problem.
I notice when I drag my safari window from the outer screen to either of the side screens, the problem goes away and returns when it comes back to the centre screen. I swapped over the mini display ports so that graphics card 1 drives the middle screen and graphics card 2 drives the outer screens and the problem moved to the outer screens.
I am still on Applecare so I called Apple and a senior tech took a look at the issue on my screen remotely. He decided on replacing the graphics card. This is being sent now so I report back once its installed to let you know if it made a difference.
I am also going to try swapping out one of my cards with another colleagues card to see if I can establish if its a bug in Yosemite or an issue with a specific ATI card, or indeed just a problem when you run two cards.
In the mean time I would be interested to hear if any of you guys found a workaround.

My screen flickers in Safari MacBook Pro Retina 2012

My screen flickers in a totally random fashion and only in Safari when I am on the internet. It happens more or less on certain web pages and not very often, but it is very annoying when it does happen. My machine is a Macbook Pro Retina 15" late 2012 release. I have seen other posts on this issue dating back to 2012, however, there were not solutions submitted leaving me to believe that there is no solution or I may have missed it. People with the same problem say they have taken in their laptops to have them replaced by Apple only to find out their problem still exists, leading many to believe it's likely to be a software issue. Anyone have any ideas or answers to this issue?

Hey dhaynes3818,
Thanks for the question. I understand that you are experiencing issues with Safari on your MacBook Pro. To troubleshoot these issues, lets follow the steps in this article:
Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues - Apple Support
http://support.apple.com/en-us/HT203353
Thanks,
Matt M.

IMac 10,1 screen flickers

The screen flickers after I have been on the computer for 10-15 minutes. Back in January, the hard drive failed and was replaced. Is flickering a sign that the video display is about to die, or something less of a pain in the rear?

Unfortunately I cannot help, but I have the same issue. What I observe is that it tends to get better the longer the machine runs, i.e. heat becomes it. From Leopard to Lion the iMac would not go to sleep ever, only display sleep (black screen), but the rest would be running. During that time I hardly ever had any screen flickering issues. Only when I booted up after a prolonged period of rest (the machine, not me). Under Mountain Lion it seems it's gotten past its insomnia. So I have frequent screen flickering, but after some 30 minutes of activity it tends to bget better. But I seem to observe a slow digression. That's all I can say. My Harddisk was replaced years ago by an Apple Store. I am wondering whether it's financially wise to bother with an old machine like that. But I hate to throw things away...

Wlan problem with iMac yosemite

When opening iMac it has difficulties to find WLAN network. I have to use network assistant several times and shut down the computer.
Sometimes there are no difficulties, sometimes i have to try half a dozen times.
My new iMac Yosemite was created by copying with Thunderbolt the contents of my old iMac, where I used in the beginning Airport.
Now I have cable modem.

Welcome to Apple Support Communities
The screen is damaged. Take it to an Apple Store

New iMac 27inch screen flickering/tearing/shutoff (continued)

This thread is a continuation of [New iMac 27inch screen flickering/tearing/shutoff|http://discussions.apple.com/thread.jspa?threadID=22 12682]. The thread was becoming too long and was causing some browsers to time out. The older thread has been locked.

citrus101 wrote:
Hi Brett L,
thank you for the coordination of this helpful thread. Are you Apple? If yes, please allow me to ask you three questions:
1) The Display Firmware stopped for over 90% the flicker issue, but what has this Firmware changed exactly?
2) Is Apple preparing a fix for the yellow tinge?
3) When will it be save to buy a new iMac?
Thank you for your efforts.
Hello Citrus.
Excellent questions.
I hope that Apple will authorize Brett L. to provide us with some clear, honest answers to them . . . although, as I pointed out before, it would seem by the latest messages that have been posted in this thread -- that is, the *original thread* -- that through their actions, Apple has already provided us with their answer -- and solution -- to the yellow tinge issue; and that is the replacement of the LCD panel.
As to what the most recent display firmware update did, I am doubtful that Apple will allow Brett to reveal that kind of information, but we can be hopeful.
As far as when it will be safe to purchase a new iMac, I seriously doubt that Apple will say anything which would suggest that it is not safe to purchase a new iMac now. What company is going to say "Don't buy our product now. It's not safe"?
For my part, I have now contacted Apple regarding the issues that I am having with my 27" iMac, and I will wait over the next few days to see how things play out. Based on the testimonies of others here, I don't expect Apple to disappoint. I have the confidence that they want to leave me a satisfied customer who will continue to purchase their products in the future.
Message was edited by: Warren Beasley

Screen flickering on iMac (Yosemite) with Safari overload?

Similar Messages

Maybe you are looking for