My iMac is giving me a blank white screen at startup help

I just installed the sims 3 on my iMac and after the installation it kept giving me the spinning wheel so I restarted it. Once it restarted it just gave me a blank white screen for thirty minutes so I restarted it and held the option key so I could go into the recovery HD and repair the disk but still blank white screen. Now I've run out of ideas.

Brendan,
I would post this in the iMac forum for a quicker reply.

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My imac 27 inch is stuck on white screen at startup why?

How come my imac is stuck on white screen?

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Imac cant pass apple logo with white screen at startup!

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White screen on startup

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Hello KCC4ME,
You may try booting your Mac in Safe Boot, as it can resolve many issues that may prevent a successful login.
OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/HT1564
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OS X Mavericks: If you think you have incompatible login items
http://support.apple.com/kb/PH14201
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Josh Mellicker wrote:
Does the white screen have a series of small multicolored color "chips" on it? And is there a band at the bottom that is half "noise"?
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EtreCheck version: 1.9.15 (52)
Report generated August 30, 2014 at 6:56:41 PM EDT
Hardware Information: ?
    iMac (21.5-inch, Mid 2011) (Verified)
    iMac - model: iMac12,1
    1 2.5 GHz Intel Core i5 CPU: 4 cores
    4 GB RAM
Video Information: ?
    AMD Radeon HD 6750M - VRAM: 512 MB
        iMac 1920 x 1080
System Software: ?
    OS X 10.9.4 (13E28) - Uptime: 0 days 0:16:53
Disk Information: ?
    ST3120026AS disk0 : (120.03 GB)
    S.M.A.R.T. Status: Verified
        EFI (disk0s1) <not mounted>: 209.7 MB
        Untitled (disk0s2) / [Startup]: 119.17 GB (87.12 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
    HL-DT-STDVDRW GA32N
USB Information: ?
    Apple Inc. FaceTime HD Camera (Built-in)
    CHICONY USB NetVista Full Width Keyboard
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
    Apple Internal Memory Card Reader
Thunderbolt Information: ?
    Apple Inc. thunderbolt_bus
Gatekeeper: ?
    Anywhere
Kernel Extensions: ?
    [loaded]    com.nvidia.CUDA (1.1.0) Support
    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
    [loaded]    com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
    CUDA: Path: /System/Library/StartupItems/CUDA
    FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Launch Daemons: ?
    [loaded]    com.adobe.fpsaud.plist Support
    [running]    com.arcsoft.eservutil.plist Support
    [running]    com.bjango.istatmenusdaemon.plist Support
    [loaded]    com.oracle.java.Helper-Tool.plist Support
    [running]    com.sophos.autoupdate.plist Support
    [running]    com.sophos.configuration.plist Support
    [running]    com.sophos.intercheck.plist Support
    [running]    com.sophos.notification.plist Support
    [running]    com.sophos.scan.plist Support
    [running]    com.sophos.sxld.plist Support
    [running]    com.sophos.webd.plist Support
Launch Agents: ?
    [running]    com.arcsoft.esinter.plist Support
    [running]    com.bjango.istatmenusagent.plist Support
    [loaded]    com.nvidia.CUDASoftwareUpdate.plist Support
    [loaded]    com.oracle.java.Java-Updater.plist Support
    [running]    com.sophos.uiserver.plist Support
User Login Items: ?
    Macs Fan Control
    Firefox
Internet Plug-ins: ?
    FlashPlayer-10.6: Version: 14.0.0.176 - SDK 10.6 Support
    Flash Player: Version: 14.0.0.176 - SDK 10.6 Support
    QuickTime Plugin: Version: 7.7.3
    JavaAppletPlugin: Version: Java 7 Update 67 Check version
    Default Browser: Version: 537 - SDK 10.9
Audio Plug-ins: ?
    BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
    AirPlay: Version: 2.0 - SDK 10.9
    AppleAVBAudio: Version: 203.2 - SDK 10.9
    iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
    Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
    CUDA Preferences Support
    Fan Control Support
    Flash Player Support
    Java Support
Time Machine: ?
    Time Machine not configured!
Top Processes by CPU: ?
         1%    WindowServer
         1%    fontd
         0%    firefox
         0%    SystemUIServer
         0%    SophosWebIntelligence
Top Processes by Memory: ?
    229 MB    firefox
    156 MB    SophosScanD
    152 MB    InterCheck
    131 MB    com.apple.IconServicesAgent
    115 MB    SophosAntiVirus
Virtual Memory Information: ?
    424 MB    Free RAM
    1.53 GB    Active RAM
    1.37 GB    Inactive RAM
    699 MB    Wired RAM
    1.26 GB    Page-ins
    0 B    Page-outs

I'd start by getting rid of the following software responsible for these extensions.
Kernel Extensions: ?
    [loaded]    com.nvidia.CUDA (1.1.0) Support
    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
    [loaded]    com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
    CUDA: Path: /System/Library/StartupItems/CUDA
    FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Use the uninstaller provided with the Sophos software. You can uninstall CUDA via the preference pane. Be sure you remove the com.nvidia.CUDA extension which is located in the /System/Library/Extensions/ folder. Not sure if Fan Control has an uninstaller so you will have to do it manually:
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item. Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder. Log In Items are set in the Accounts preferences. Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab. Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS. Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term. Unfortunately Spotlight will not look in certain folders by default. You can modify Spotlight's behavior or use a third-party search utility, EasyFind, instead.
Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
    1. AppZapper
    2. AppDelete
    3. Automaton
    4. Hazel
    5. AppCleaner
    6. CleanApp
    7. iTrash
    8. Amnesia
    9. Uninstaller
10. Spring Cleaning
For more information visit The XLab FAQs and read the FAQ on removing software.
Be sure to remove your two Login Items. Finally do this:
Reinstall Lion, Mountain Lion, or Mavericks without erasing 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
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 then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Lion, Mountain Lion, or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.

I only see a blank white screen when I try to open the itunes store.

I have an iMac running OS X 10.8.4 and cannot view the itunes store. My library shows but the store is a blank white screen. On my macbook at home with the same system it works fine.

Hi Jim,
I am having the same problem so I followed your advice and signed out, restarted, and signed back in. It let me look at my account in the itunes store but when I try to leave my account and go to the actual itunes store, it is still just a blank white screen. There are home, music, movies, etc. tabs. Movies and tv shows both have a black screen but the rest are white. Do you have any other suggestions?

When I open safari I get a blank white screen.

When I open safari I get a blank white screen. When I open top sites, and choose google, the screen is still blank, with the search bar at the top a quarter full. If it does open, it suddenly becomes unresponsive and returns to that blank, white screen. I'v tried everything I can think of, but nothing works.
On a side note, everything from mail to iphoto to word works - just not safari. I'm using a mid-11 iMac 21.5"i5 running on mountain lion.
Also did I post this in the right place? I'm new to this.

Read this whole message before doing anything.
Back up all data.
Quit Safari if it’s running. Then select
 ▹ Force Quit…
from the menu bar. A small window will open with a list of running applications. Safari may appear in that list, even though you quit it. If so, select it and press return. Close the window.
Step 1
In the Finder, press the key combination shift-command-A to open the Applications folder. Select the Safari icon in that folder and press the key combination command-I to open the Info window. There’s a checkbox in the Info window labeled Open in 32-bit mode. Uncheck it, if checked. Close the Info window and the Applications folder.
If Adobe Flash Player is installed, select
 ▹ System Preferences ▹ Flash Player ▹ Advanced
and click Delete All. Close the preference pane.
Hold down the option key and select
Go ▹ Library
from the Finder menu bar. Delete the following items from the Library folder (some may not exist):
Caches/com.apple.Safari
Caches/com.apple.WebKit.PluginProcess
Caches/Metadata/Safari
Preferences/com.apple.WebKit.PluginHost.plist
Preferences/com.apple.WebKit.PluginProcess.plist
Saved Application State/com.apple.Safari.savedState
Leave the Library folder open. Try Safari again. If it works now, stop here. Close the Library folder. If you still have problems, continue.
Step 2
Triple-click anywhere in the line below to select it:
open $TMPDIR../C
Copy the selected text to the Clipboard (command-C).
Quit Safari again. Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V). A folder should open. If there's a subfolder with the name "com.apple.Safari", delete it, even if it's empty. Quit Terminal. Close the folder. Launch Safari and test.
Step 3
If Safari still doesn’t work right, quit, go back to the Finder and move the following items from the open Library folder to the Desktop (some may not exist):
Cookies/Cookies.binarycookies
Internet Plug-Ins
Preferences/com.apple.Safari.LSSharedFileList.plist
Preferences/com.apple.Safari.plist
Preferences/com.apple.Safari.RSS.plist
Preferences/com.apple.WebFoundation.plist
PubSub/Database
Safari
(Note: you are not moving the Safari application. You’re moving a folder named “Safari.”)
Try again. This time Safari should perform normally, but your settings and bookmarks will be lost. The default set of bookmarks will be restored. Delete them all.
If the issue is still not resolved, quit Safari again and put all the items you moved to the Desktop back where they were, overwriting the newer ones that may have been created in their place. You don’t need to replace the files you deleted in step 1. Stop here and post again.
If Safari is now working normally (apart from the lost settings), look inside the “Safari” folder on the Desktop for a file named “Bookmarks.plist”. Select
File ▹ Import Bookmarks
from the Safari menu bar. Import from that file. Recreate the rest of your Safari settings. You can then delete the items you moved to the Desktop.
Note: This step will remove your Safari Extensions, if any, and their settings. If you choose to restore them, do so one at a time, testing after each step to make sure you haven’t restored the problem.
If you don’t like the results of step 3, you can undo it completely by quitting Safari and restoring the items you moved or deleted in that step from your backup, overwriting any that were created in their place.

My imac stuck on white screen on startup

hi i got a late 2009 27" imac with i7, recently i restart the imac, it just keep stuck on the white screen right after i hit the power, no apple logo no chime, just blank white screen. i unplug the power cord for 1 hour and plug back in still the same.

Start your computer with the original DVD that came with system and repair your disk with disk utility, also repair permissions. http://support.apple.com/kb/TS1417

IMac Freezes at white screen during startup

Hello,
I was off of my iMac for an hour or two so my screen saver when on. I went to wake the computer and it was frozen. I tried using the keyboard and mouse to wake up the computer from the screen saver, but it would not work, so I powered the iMac down manually from the button on the back. I let it sit for 15 minutes, then I tried to start the computer up again. Now at start up, I get to a blank white screen with the spinning moving pin wheel, and that is it. Any suggestions?

You could try to use SafeBoot mode on startup, essentially you'd hold the Shift
key down on startup, perhaps you may need to login after waiting quite awhile,
then continue holding the shift key down until you see a traditional desktop.
And then use Disk Utility to verify HDD, & repair disk permissions.+ Restart.
Or if you have a system install-restore DVD, boot from that and have the
Installer's version of Disk Utility check verify repair the hard disk drive.
It can also repair disk permissions, too, from the booted version of D.U.
Then when it is done, choose the startup disk from installer menu options.
The DVD should eject, but if not, it should be ignored as a boot volume
after you've chosen the Mac HD as a boot system.
PS: If your computer is now running a system later than Snow Leopard,
where no DVD would be needed if it has a Recovery partition in the HDD
then you could see about booting into Recovery (command + R) to access
the later system's OS X Utilities, and choose Disk Utility to check/repair, etc.
These may help.
Good luck!
edited

My iMac is giving me a blank white screen at startup help

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