24" iMac screen garbled when using Expose.

Occasionally when I click both sides of the mouse to use the Expose function to see all my open windows the display flickers around and I get a garbled image as shown in the photo. As I move the mouse across the screen it clears up the garbled graphics. It also clears up when I undo the Expose. Happens may 20% of the time. Anyone else have this problem and found out what was causing it?

My 24" iMac also display garbage as same as your picture.
Strangely, it's not consistant. Sometimes at start up time
sometimes when I click the menu bar.
(I wanted post my screen shot but I couldn't)
I can clean up garbage screen when I drug around the
application window. However, it will come back again.
I don't know what's trigger it.
I think this problem happened aftert I update OS with patches.
I'm also want to know the solution.

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I have only been able to read your reply by going online on my phone -
I started up my iMac in safe mode on Saturday morning and reran Disk Utility , no problems.
I shut it down and re started it as normal. Whilst I was able to use my Mail and MS entourage and Safari brower,
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There are 4001 messages (11-02 to 13-02)
I have only included some of the most recent
13/02/2013 15:59:33.000 kernel[0]: disk0s2: I/O error.
13/02/2013 15:59:33.350 AddressBookSync[296]: [0x7feff941fd50] |ISDException|Error| *** SyncServices Exception
Type                 : ISyncDataDirectoryCorruptedException
Reason               : Detected database corruption: 5 (Input/output error)
Filesystem Reason : Input/output error
Database Path        : */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ data.syncdb
Database Access Mode : Read Write
Open SQLite Files    :
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ recordids.synciddb
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ constructedids.synciddb
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ data.syncdb
Stack Trace          :
0   SyncServices                        0x000000010343222c _ISDSQLiteBlowOut + 1107
1   SyncServices                        0x0000000103431dc5 _ISDSQliteFullIOErrCorruptionHandler + 821
2   SyncServices                        0x0000000103399dcc -[ISDDatabase(SqliteHelpers) stepStatement:] + 238
3   SyncServices                        0x00000001033a1cb0 -[ISDDatabase(SqliteHelpers) runStatement:withBoundObjects:startingAtIndex:callback:context:] + 376
4   SyncServices                        0x00000001033a23fe -[ISDDataDatabase updateRelationshipsForRecordsInDictionary:withRecordIds:stringTable:constructRe lationshipMap:] + 182
5   SyncServices                        0x000000010339f95c -[ISDDataDatabase createDictionaryAndArray:withRecordsWithIdentifiers:constructRelationshipMap:] + 334
6   SyncServices                        0x000000010339f6b3 -[ISDRecordStore createDictionaryWithRecordsWithIdentifiers:constructRelationshipMap:] + 69
7   SyncServices                        0x00000001033c6dbf -[ISyncConcreteSession _newDictionaryWithRecordsPushedByClient] + 249
8   SyncServices                        0x00000001033c6815 -[ISyncConcreteSession _processModifiedRecords] + 161
9   SyncServices                        0x00000001033c6515 -[ISyncConcreteSession _processPushedStuff] + 488
10 SyncServices                        0x00000001033c5f28 -[ISyncConcreteSession _leavePushing] + 80
11 SyncServices                        0x00000001033c2380 -[ISyncConcreteSession _transitionStateMachine:] + 339
12 SyncServices                        0x00000001033c37f7 -[ISyncConcreteSession _prepareToPullChangesForEntityNames:inBackground:target:selector:] + 232
13 SyncServices                        0x00000001033c36c9 -[ISyncConcreteSession prepareToPullChangesForEntityNames:beforeDate:] + 37
14 AddressBookSync                     0x00000001015b2d6d AddressBookSync + 23917
15 AddressBookSync                     0x00000001015b1fea AddressBookSync + 20458
16 AddressBookSync                     0x00000001015b1ab5 AddressBookSync + 19125
17 AddressBookSync                     0x00000001015b9454 AddressBookSync + 50260
18 libdyld.dylib                       0x00000001048157e1 start + 0
13/02/2013 15:59:33.353 WindowServer[113]: reenable_update_for_connection: UI updates were finally reenabled by application "Microsoft Entourage" after 104.98 seconds (server forcibly re-enabled them after 1.00 seconds)
13/02/2013 15:59:33.420 AddressBookSync[296]: [0x7feff941fd50] |ISDException|Error| *** SyncServices Exception
Type                 : ISDSQLiteStatementExecutionException
Reason               : error executing 'rollback transaction;': 1 (cannot rollback - no transaction is active)
Filesystem Reason : Input/output error
Database Path        : */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ data.syncdb
Database Access Mode : Read Write
Open SQLite Files    :
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ recordids.synciddb
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ constructedids.synciddb
          */Library/Application Support/SyncServices/Local/clientdata/633a1ba25cb8241bbde44acb603ee1e822cde772/ data.syncdb
Stack Trace          :
0   SyncServices                        0x000000010343222c _ISDSQLiteBlowOut + 1107
1   SyncServices                        0x0000000103394818 sqliteExecuteWithCallbackAndOptions + 660
2   SyncServices                        0x0000000103394559 -[ISDDatabase(SqliteHelpers) execute:] + 207
3   SyncServices                        0x0000000103440451 -[ISDRecordStore rollbackChanges] + 57
4   SyncServices                        0x00000001033c5f0f -[ISyncConcreteSession _leavePushing] + 55
5   SyncServices                        0x00000001033c2380 -[ISyncConcreteSession _transitionStateMachine:] + 339
6   SyncServices                        0x00000001033c6680 -[ISyncConcreteSession _processPushedStuff] + 851
7   SyncServices                        0x00000001033c5f28 -[ISyncConcreteSession _leavePushing] + 80
8   SyncServices                        0x00000001033c2380 -[ISyncConcreteSession _transitionStateMachine:] + 339
9   SyncServices                        0x00000001033c37f7 -[ISyncConcreteSession _prepareToPullChangesForEntityNames:inBackground:target:selector:] + 232
10 SyncServices                        0x00000001033c36c9 -[ISyncConcreteSession prepareToPullChangesForEntityNames:beforeDate:] + 37
11 AddressBookSync                     0x00000001015b2d6d AddressBookSync + 23917
12 AddressBookSync                     0x00000001015b1fea AddressBookSync + 20458
13 AddressBookSync                     0x00000001015b1ab5 AddressBookSync + 19125
14 AddressBookSync                     0x00000001015b9454 AddressBookSync + 50260
15 libdyld.dylib                       0x00000001048157e1 start + 0
13/02/2013 15:59:33.730 Microsoft Sync Services[293]: Warning: NSBundle NSBundle </Users/name/Library/Sync Services/Schemas/MicrosoftOfficeNotes.syncschema> (not yet loaded) was released too many times. For compatibility, it will not be deallocated, but this may change in the future. Set a breakpoint on __NSBundleOverreleased() to debug
13/02/2013 16:00:04.327 mds[35]: (Error) Server: Disabled store registered for scope "/Library/Application Support/Apple/Fonts"
13/02/2013 16:03:25.062 WebProcess[306]: CoreAnimation: failed to create OpenGL context
13/02/2013 16:08:21.427 WebProcess[306]: CoreAnimation: unhandled combiner function: 11
13/02/2013 16:18:13.087 WindowServer[113]: Resampling logo assets. This should be considered a bug. (height = 21)
13/02/2013 16:19:26.633 com.apple.backupd[329]: Starting automatic backup
13/02/2013 16:19:27.269 com.apple.backupd[329]: Attempting to mount network destination URL: afp://name;[email protected]/Data
13/02/2013 16:19:27.797 com.apple.kextd[11]: Can't load /System/Library/Filesystems/AppleShare/afpfs.kext - dependencies not elibible during safe boot.
13/02/2013 16:19:27.807 com.apple.backupd[329]: NAConnectToServerSync failed with error: 22 for url: afp://name;[email protected]/Data
13/02/2013 16:19:28.030 com.apple.backupd[329]: Backup failed with error: 19
13/02/2013 16:21:16.867 universalaccessd[335]: CGSGetZoomParameters: Invalid connection
13/02/2013 16:21:16.867 universalaccessd[335]: CGSSetZoomParameters: Invalid connection
13/02/2013 16:21:16.867 universalaccessd[335]: CGSSetZoomParameters: Invalid connection
13/02/2013 16:21:43.190 Finder[184]: *** WARNING: -[NSImage compositeToPoint:operation:fraction:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
13/02/2013 16:21:43.191 Finder[184]: *** WARNING: -[NSImage compositeToPoint:fromRect:operation:fraction:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
13/02/2013 16:25:39.096 universalaccessd[339]: CGSGetZoomParameters: Invalid connection
13/02/2013 16:25:39.096 universalaccessd[339]: CGSSetZoomParameters: Invalid connection
13/02/2013 16:25:39.096 universalaccessd[339]: CGSSetZoomParameters: Invalid connection
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http://forums.adobe.com/message/5449199
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Message was edited by: GSVAI

An update:
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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.
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Hi
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http://www.geocities.com/worldofdarkness89/MBPscreen.png
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Hello and Welcome to Apple Discussions.
Have you tried Zapping the PRAM?
The PRAM holds various settings such as display settings.
regards
mrtotes

24" iMac screen garbled when using Expose.

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