Grey screen while using DU to repair TM backups.

I've been having multiple problems with applicaitons not opening, the finder not responding, and Time Machine backups not happening since Feb. 4 when I downloaded a large number of jpg images from a SD card to my HD. Have done that many times before with no problem.
I've been reading these discussions and have gone to related sites (Pondini) trying to find solutions to get everything back to normal. I've run Disk Utility in Recover mode and have repaired permissions and hard drive several times. No problems were reported by Disk Utility. I've removed the Time Machine disk in System Preferences and restored it. I've un-enabled file sharing and enabled it again in Airport Utility.
The common denominator seems to be Time Machine. No backups have succeeded since February 4. Tonight I read the instruction for repairing the sparse bundle disk (or the TM Backup disk image) and have followed the instructions to do that. I launched Disk Utility, selected TM Backups and selected Repair disk. The repair process is running. Then the display went to a medium grey screen in the middle of the disk repsir process. I've seen this grey screen before in the days since Feb. 4. At other times I've shut the computer down using the power button. But this time I don't know if I should do that or not. Does the grey screen indicate that nothing is working now or is the disk repair process on the TM backup disk going on in the background?
I am at a loss. Since I don't think it will hurt anything to leave it alone for now, I am not going to shut it down. But this has been a major PITA lately. I've spent a lot of hours looking for a solution and a lot of hours shutting down my computer with the power button, turning it back on, shutting it back off, turning it on.
I upgraded to OS X 10.8.2 in November and other than a problem with not being able to empty the trash for a few days in January, there were no problems till Feb. 4. I upgraded our newer iMac to ML 10.8.2 in November also and there have not been any problems with that.
The computer that is having problems is a 2009 20" iMac.

I was able to open Console after shutting down. But the shutdown process was not as simple as it should be which is typical of how things are going lately. I selected Shut Down from the menu and it began the shut down process but got as far as a white/light grey screen and stopped there. So I finished the shut down by pressing the Power Button.
Here are the results of Step 1. I hope I've done this correctly. I copied the Full Report for one item. I apologize if this is overly long. I didn't know what I should eliminate, if anything.
Step 1:
mdworker(477) deny mach-lookup com.apple.ls.boxd
Process:         mdworker [477]
Path:            /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework /Versions/A/Support/mdworker
Load Address:    0x105322000
Identifier:      mdworker
Version:         ??? (???)
Code Type:       x86_64 (Native)
Parent Process: launchd [203]
Date/Time:       2013-02-13 00:38:07.915 -0500
OS Version:      Mac OS X 10.8.2 (12C60)
Report Version: 8
Thread 0:
0   libsystem_kernel.dylib            0x00007fff8d6db686 mach_msg_trap + 10
1   CoreFoundation                    0x00007fff962d5803 __CFRunLoopServiceMachPort + 195
2   CoreFoundation                    0x00007fff962daee6 __CFRunLoopRun + 1078
3   CoreFoundation                    0x00007fff962da6b2 CFRunLoopRunSpecific + 290
4   CoreFoundation                    0x00007fff962e9371 CFRunLoopRun + 97
5   mdworker                          0x000000010532aba9
6   libdyld.dylib                     0x00007fff90bef7e1 start + 0
Thread 1:
0   libsystem_kernel.dylib            0x00007fff8d6ddd16 kevent + 10
1   libdispatch.dylib                 0x00007fff8d8539ee _dispatch_mgr_thread + 54
Thread 2:
0   libsystem_kernel.dylib            0x00007fff8d6dd6d6 __workq_kernreturn + 10
1   libdispatch.dylib                 0x00007fff8d852073 _dispatch_queue_wakeup_global_slow + 59
2   libdispatch.dylib                 0x00007fff8d851ecd _dispatch_wakeup + 132
3   libdispatch.dylib                 0x00007fff8d852027 _dispatch_resume_slow + 17
4   libdispatch.dylib                 0x00007fff8d8510b6 _dispatch_client_callout + 8
5   libdispatch.dylib                 0x00007fff8d851041 dispatch_once_f + 50
6   LaunchServices                    0x00007fff8cc15c40 init() + 47
7   LaunchServices                    0x00007fff8cc84d0a lsbox_preflightAppLaunch + 19
8   LaunchServices                    0x00007fff8cc0f341 _LSFindOrRegisterBundleNode + 857
9   LaunchServices                    0x00007fff8cc6bb02 _LSRegisterNode + 75
10 LaunchServices                    0x00007fff8cc17a0f _LSBundleCopyOrCheckNode + 1047
11 LaunchServices                    0x00007fff8cbff5b6 _LSCopyLibraryItemURLs + 486
12 mdworker                          0x0000000105352014
13 libdispatch.dylib                 0x00007fff8d854f01 _dispatch_call_block_and_release + 15
14 libdispatch.dylib                 0x00007fff8d8510b6 _dispatch_client_callout + 8
15 libdispatch.dylib                 0x00007fff8d85247f _dispatch_queue_drain + 235
16 libdispatch.dylib                 0x00007fff8d8522f1 _dispatch_queue_invoke + 52
17 libdispatch.dylib                 0x00007fff8d8521c3 _dispatch_worker_thread2 + 249
18 libsystem_c.dylib                 0x00007fff89d05cab _pthread_wqthread + 404
19 libsystem_c.dylib                 0x00007fff89cf0171 start_wqthread + 13
Thread 3:
0   libsystem_kernel.dylib            0x00007fff8d6dd6d6 __workq_kernreturn + 10
1   libsystem_c.dylib                 0x00007fff89d05cb3 _pthread_wqthread + 412
2   libsystem_c.dylib                 0x00007fff89cf0171 start_wqthread + 13
Thread 4:
0   libsystem_kernel.dylib            0x00007fff8d6db686 mach_msg_trap + 10
1   liblaunch.dylib                   0x00007fff8feef7c4
2   liblaunch.dylib                   0x00007fff8feee4d9 bootstrap_look_up3 + 69
3   libxpc.dylib                      0x00007fff8e445c21 _xpc_connection_bootstrap_look_up_slow + 371
4   libxpc.dylib                      0x00007fff8e444c82 _xpc_connection_init + 1062
5   libdispatch.dylib                 0x00007fff8d8510b6 _dispatch_client_callout + 8
6   libdispatch.dylib                 0x00007fff8d85247f _dispatch_queue_drain + 235
7   libdispatch.dylib                 0x00007fff8d8522f1 _dispatch_queue_invoke + 52
8   libdispatch.dylib                 0x00007fff8d852448 _dispatch_queue_drain + 180
9   libdispatch.dylib                 0x00007fff8d8522f1 _dispatch_queue_invoke + 52
10 libdispatch.dylib                 0x00007fff8d8521c3 _dispatch_worker_thread2 + 249
11 libsystem_c.dylib                 0x00007fff89d05cab _pthread_wqthread + 404
12 libsystem_c.dylib                 0x00007fff89cf0171 start_wqthread + 13
Thread 5:
0   libsystem_kernel.dylib            0x00007fff8d6dd6d6 __workq_kernreturn + 10
1   libsystem_c.dylib                 0x00007fff89d05cb3 _pthread_wqthread + 412
2   libsystem_c.dylib                 0x00007fff89cf0171 start_wqthread + 13
Thread 6:
0   libsystem_c.dylib                 0x00007fff89cf0164 start_wqthread + 0
Binary Images:
       0x105322000 -        0x10537bff7 mdworker (707.3) <105316D8-F5DF-3079-96EF-0EF0986EB053> /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework /Versions/A/Support/mdworker
    0x7fff89cef000 -     0x7fff89dbbfe7 libsystem_c.dylib (825.25) <8CBCF9B9-EBB7-365E-A3FF-2F3850763C6B> /usr/lib/system/libsystem_c.dylib
    0x7fff8cbfb000 -     0x7fff8ccacfff com.apple.LaunchServices (539.7 - 539.7) <DA7C602E-5E01-31B8-925D-B45360CA089F> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchS ervices.framework/Versions/A/LaunchServices
    0x7fff8d6cb000 -     0x7fff8d6e6ff7 libsystem_kernel.dylib (2050.18.24) <C0535565-35D1-31A7-A744-63D9F10F12A4> /usr/lib/system/libsystem_kernel.dylib
    0x7fff8d84f000 -     0x7fff8d864ff7 libdispatch.dylib (228.23) <D26996BF-FC57-39EB-8829-F63585561E09> /usr/lib/system/libdispatch.dylib
    0x7fff8e43c000 -     0x7fff8e45eff7 libxpc.dylib (140.41) <FAC04D8B-680E-325F-8F0C-DD69859D0E01> /usr/lib/system/libxpc.dylib
    0x7fff8feec000 -     0x7fff8fef4fff liblaunch.dylib (442.26.2) <2F71CAF8-6524-329E-AC56-C506658B4C0C> /usr/lib/system/liblaunch.dylib
    0x7fff90bed000 -     0x7fff90bf0ff7 libdyld.dylib (210.2.3) <F59367C9-C110-382B-A695-9035A6DD387E> /usr/lib/system/libdyld.dylib
    0x7fff962a6000 -     0x7fff9648ffff com.apple.CoreFoundation (6.8 - 744.12) <EF002794-DAEF-31C6-866C-E3E3AC387A9F> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
2/13/13 12:38:08.000 AM kernel[0]: Sandbox: sandboxd(478) deny mach-lookup com.apple.coresymbolicationd
2/13/13 12:41:51.000 AM bootlog[0]: BOOT_TIME 1360734111 0

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Del

Screen flickers static screen while using it.. Do I replace video or screen

While using my screen it flickers static..

@swademom ,
Hello and thank you for posting on the HP support forums. The screen flicker may be caused by many things. It could be as simple as a loose connector.
So that we can help you out here with this issue could you please post back with the systems full Model and Product number. Here is a link that will help you find this information.
How Do I Find My Model Number or Product Number?
Please post back soon.
Thank you again for posting and have a great day.
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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

IMac goes to blank white screen while using have to unplug

For the second time now my iMac 2.8 ghz Core 2 Duo has gone to a blank white screen right in the middle of doing work. The machine sounds the same but the only way to get it back is to unplug it. I've searched around and found booting issues but that is not my problem. It just goes blank white right in the middle of using it.

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"?
michaelfromutah wrote:
...I inserted my reinstall disk and double clicked the restore icon...
What "restore icon"?
If you have the Mac OS X install disc in the drive, switch on your Mac, and hold the Option (⌥) key.
You will see a grey screen, with Macintosh HD & after a few seconds, a CD with Mac OS X Install DVD.
Click on the DVD and then the arrow underneath it. This will start up the Mac OS X installer.
From here, you need to choose your language and then from the Utilities menu, choose Disk Utility.
Then choose Macintosh HD from the left, and choose "Verify Disk" not permissions
Let us know how you go.

Turn off laptop screen while using iTunes? Or best screen saver?

Is there a way to turn off the iBook display and still let the computer use iTunes? I can't find anything on this. If that isn't possible, what would be the best screen saver for actually saving the screen? If you know what I mean....

That does work--thank you. I wanted this solution for iTunes. This came to my attention when a friend of mine was using his MacBook to run a movie on a television, and he was complaining about the fact that the MacBook display could not be shut off while exporting the feed to the tv. You've answered my question, but I'm going to amend the topic to include shutting off screen while exporting a video feed--perhaps someone knows the answer to that. (I don't have anything to port a feed too, or I'd try it myself.) Thank you!

Grey screen while using DU to repair TM backups.

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