24" iMac Screen Freezes since 10.6.3 update - pls help!

I don't know if this is just coincidence or not, but since updating my iMac to 10.6.3 it keeps on crashing. On 3 separate occasions today, whilst using my Mac the screen has gone completely black with thin white lines down it.....see pic below:
http://picasaweb.google.com/lh/photo/6SYzhCgVYEU5TBKqRfOQ1Q?feat=directlink
The fans and hard disk are still running but it will not respond to any keyboard or mouse presses - I simply have to turn it off by holding the power button in.
It will then restart as usual.
Anyone got any ideas? Do you think that if I was to re-install Mac OS X from my original install disk it could solve the issue?
Thanks
Darren

Experiencing the exact same issue - usually when using iTunes or Safari.
Screen becomes garbled with junk video artifacts, network connection drops and then the only thing I can do is move the mouse around. I cannot interact with the screen at all. The only "fix" is to do a hard power-down via the power button on back.
There seems to be no rhyme or reason to the freeze - it is not reproducible in any timeframe or activity.
I attempted the following to rectify:
• Reformat
• Reinstall 10.6.0 from SL DVD
• Created entirely new user
• Repaired permissions via Disk Utility on first login
• Restarted
• Updated OS to 10.6.3 from Combo update
• Repaired permissions via Disk Utility again
• Restarted three times to build up caches
• System froze as before after roughly 25 minutes of web browsing and browsing iTunes Store
This points to a major graphics update bug - there is not other explanation. I have never had this kind of freeze in the two + years that I have owned this machine.
It has happened 6 times since 10.6.3 was installed.

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LChappelear wrote:
Uninstalling the updates did not help. Can anyone help me out?

My iMac screen freezes and a grey colour slowly creeps down my screen

Hi, my iMac screen freezes and a grey colour slowly creeps down the screen and has a large black square in the centre saying "You must restart your computer by pressing the power button and then pressing it again to restart" or words to that effect in English and about 4 or 5 other languages. I find this happens more frequently when I try to stream movies or tv shows. It also happened when I was trying to download a couple of tv shows from iTunes.
It also sometimes makes a wierd sound a kind of loud noise like a record stuck in a groove. This has happend many times since upgrading to Lion. I hear a lot of people on here talking about their screens going completely black and not responding. I believe that mine has only gone black a couple of times and I couldn't wake it up from "sleep mode" with the mouse or keyboard. I don't know if this is also happening to other people, but my bluetooth keyboard keeps disconnecting all the time since the upgrade as well, it's driving me nuts!! Plus my wifi will show that it is fully operational, however, I can't use the internet when I wake my computer from sleep mode. I have to click on wifi and turn wifi off then on again before i can use it.
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Hi Eric,
I don't know why it didn't work before, but here is the most recent errol log. It crashed again about an hour later. If there is a solution, i would greatly appreciate knowing what it is because I can't enjoy using my computer anymore because of these constant crasahes.
Thanks for your time.
Interval Since Last Panic Report: 1060363 sec
Panics Since Last Report:          12
Anonymous UUID:                    065BD067-AFE6-4AB4-AEF2-30EF089ECE4C
Mon Oct 3 16:08:51 2011
panic(cpu 0 caller 0xffffff80002c268d): Kernel trap at 0xffffff7f80eb7282, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x00000001006de5dc, CR3: 0x0000000035e9a003, CR4: 0x00000000000206e0
RAX: 0x00000000fffd1485, RBX: 0x0ae8df8948ee7500, RCX: 0xffffff800c5d1d74, RDX: 0xffffff807fbf3584
RSP: 0xffffff807fbf3310, RBP: 0xffffff807fbf3370, RSI: 0xffffff807b04a000, RDI: 0xffffff8000289003
R8: 0xffffff806af44e34, R9: 0xffffff807b04a078, R10: 0xfffffffffffffffe, R11: 0xffffff80002d8240
R12: 0xffffff807b04a000, R13: 0xffffff800c5d1d6c, R14: 0xffffff8000289003, R15: 0x00000005b80002a8
RFL: 0x0000000000010282, RIP: 0xffffff7f80eb7282, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0x00000001006de5dc, Error code: 0x0000000000000000, Faulting CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff807fbf2fd0 : 0xffffff8000220702
0xffffff807fbf3050 : 0xffffff80002c268d
0xffffff807fbf31f0 : 0xffffff80002d7a3d
0xffffff807fbf3210 : 0xffffff7f80eb7282
0xffffff807fbf3370 : 0xffffff7f80e9dfe5
0xffffff807fbf3510 : 0xffffff7f80ef8726
0xffffff807fbf3570 : 0xffffff7f80ef8985
0xffffff807fbf35b0 : 0xffffff7f80e869ee
0xffffff807fbf35c0 : 0xffffff7f80eb7bb5
0xffffff807fbf3630 : 0xffffff7f80e83879
0xffffff807fbf3670 : 0xffffff7f8091d255
0xffffff807fbf36b0 : 0xffffff8000639d0e
0xffffff807fbf3700 : 0xffffff7f8091d1d6
0xffffff807fbf3720 : 0xffffff7f8091d793
0xffffff807fbf3760 : 0xffffff7f8091cd81
0xffffff807fbf3790 : 0xffffff7f80e429e9
0xffffff807fbf37e0 : 0xffffff8000344b0b
0xffffff807fbf38f0 : 0xffffff80003c333d
0xffffff807fbf3b60 : 0xffffff80003caee9
0xffffff807fbf3c00 : 0xffffff80003cb3de
0xffffff807fbf3df0 : 0xffffff80003d2a6b
0xffffff807fbf3e10 : 0xffffff8000580f25
0xffffff807fbf3e60 : 0xffffff8000581185
0xffffff807fbf3e80 : 0xffffff8000532ec4
0xffffff807fbf3ee0 : 0xffffff8000533dd3
0xffffff807fbf3f20 : 0xffffff8000533ea7
0xffffff807fbf3f50 : 0xffffff80005ca88b
0xffffff807fbf3fb0 : 0xffffff80002d8383
      Kernel Extensions in backtrace:
         com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000->0xffffff7f80936fff
         com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e2c000->0xffffff7f80e63fff
            dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000
         com.apple.driver.AirPort.Atheros40(500.55.5)[01000ACB-C064-3F42-820F-BDE2008267 25]@0xffffff7f80e64000->0xffffff7f80fa3fff
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)[95ABB490-3AB5-3D5E-9C21-67089A9AE6A1]@0xffff ff7f80821000
            dependency: com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e2c000
            dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000
BSD process name corresponding to current thread: MailTab for Gmai
Mac OS version:
11B26
Kernel version:
Darwin Kernel Version 11.1.0: Tue Jul 26 16:07:11 PDT 2011; root:xnu-1699.22.81~1/RELEASE_X86_64
Kernel UUID: D52AAB80-B2BC-3C6E-BBEA-78BD28064998
System model name: iMac11,2 (Mac-F2238AC8)
System uptime in nanoseconds: 2869233943350
last loaded kext at 367480732136: com.apple.iokit.IOAVBFamily    1.0.0d22 (addr 0xffffff7f8078d000, size 36864)
last unloaded kext at 437236879883: com.apple.iokit.IOAVBFamily    1.0.0d22 (addr 0xffffff7f8078d000, size 36864)
loaded kexts:
com.apple.driver.AppleHWSensor    1.9.4d0
com.apple.driver.AppleBluetoothMultitouch    66.3
com.apple.filesystems.autofs    3.0
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleUpstreamUserClient    3.5.9
com.apple.driver.AppleMCCSControl    1.0.24
com.apple.driver.AppleHDA    2.1.1f12
com.apple.driver.AGPM    100.12.40
com.apple.driver.AppleMikeyDriver    2.1.1f12
com.apple.kext.ATIFramebuffer    7.0.4
com.apple.ATIRadeonX2000    7.0.4
com.apple.driver.AudioAUUC    1.59
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.2.0
com.apple.driver.AirPort.Atheros40    500.55.5
com.apple.driver.ACPI_SMC_PlatformPlugin    4.7.0b2
com.apple.driver.AppleLPC    1.5.1
com.apple.driver.AppleBacklight    170.1.9
com.apple.driver.AppleUSBCardReader    3.0.0
com.apple.driver.AppleIRController    309
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    32
com.apple.iokit.SCSITaskUserClient    3.0.0
com.apple.driver.AppleFWOHCI    4.8.6
com.apple.iokit.IOAHCIBlockStorage    2.0.0
com.apple.driver.AppleUSBHub    4.4.0
com.apple.driver.AppleEFINVRAM    1.5.0
com.apple.driver.AppleAHCIPort    2.1.8
com.apple.iokit.AppleBCM5701Ethernet    3.0.6b9
com.apple.driver.AppleACPIButtons    1.4
com.apple.driver.AppleUSBEHCI    4.4.0
com.apple.driver.AppleRTC    1.4
com.apple.driver.AppleHPET    1.6
com.apple.driver.AppleSMBIOS    1.7
com.apple.driver.AppleACPIEC    1.4
com.apple.driver.AppleAPIC    1.5
com.apple.driver.AppleIntelCPUPowerManagementClient    166.0.0
com.apple.nke.applicationfirewall    3.0.30
com.apple.security.quarantine    1
com.apple.driver.AppleIntelCPUPowerManagement    166.0.0
com.apple.driver.AppleBluetoothHIDKeyboard    152.3
com.apple.driver.AppleHIDKeyboard    152.3
com.apple.driver.AppleMultitouchDriver    220.62
com.apple.driver.IOBluetoothHIDDriver    2.5f17
com.apple.kext.triggers    1.0
com.apple.driver.DspFuncLib    2.1.1f12
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.kext.ATI4600Controller    7.0.4
com.apple.kext.ATISupport    7.0.4
com.apple.iokit.IOSurface    80.0
com.apple.iokit.IOBluetoothSerialManager    2.5f17
com.apple.iokit.IOSerialFamily    10.0.5
com.apple.iokit.IOFireWireIP    2.2.3
com.apple.iokit.IOAudioFamily    1.8.3fc11
com.apple.kext.OSvKernDSPLib    1.3
com.apple.driver.AppleHDAController    2.1.1f12
com.apple.iokit.IOHDAFamily    2.1.1f12
com.apple.iokit.IO80211Family    400.40
com.apple.driver.AppleSMC    3.1.1d2
com.apple.driver.IOPlatformPluginFamily    4.7.0b2
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleBacklightExpert    1.0.3
com.apple.iokit.IONDRVSupport    2.3
com.apple.iokit.IOGraphicsFamily    2.3
com.apple.driver.BroadcomUSBBluetoothHCIController    2.5f17
com.apple.driver.AppleUSBBluetoothHCIController    2.5f17
com.apple.iokit.IOBluetoothFamily    2.5f17
com.apple.iokit.IOSCSIBlockCommandsDevice    3.0.0
com.apple.iokit.IOUSBMassStorageClass    3.0.0
com.apple.iokit.IOUSBHIDDriver    4.4.0
com.apple.driver.AppleUSBMergeNub    4.4.0
com.apple.driver.AppleUSBComposite    3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.0.0
com.apple.iokit.IOBDStorageFamily    1.6
com.apple.iokit.IODVDStorageFamily    1.6
com.apple.iokit.IOCDStorageFamily    1.7
com.apple.driver.XsanFilter    403
com.apple.iokit.IOFireWireFamily    4.4.3
com.apple.iokit.IOAHCISerialATAPI    2.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.0.0
com.apple.iokit.IOUSBUserClient    4.4.0
com.apple.iokit.IOAHCIFamily    2.0.6
com.apple.iokit.IOEthernetAVBController    1.0.0d5
com.apple.iokit.IONetworkingFamily    2.0
com.apple.driver.AppleEFIRuntime    1.5.0
com.apple.iokit.IOHIDFamily    1.7.0
com.apple.iokit.IOUSBFamily    4.4.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    165
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    7
com.apple.driver.DiskImages    326
com.apple.iokit.IOStorageFamily    1.7
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.4
com.apple.iokit.IOPCIFamily    2.6.5
com.apple.iokit.IOACPIFamily    1.4
Model: iMac11,2, BootROM IM112.0057.B00, 2 processors, Intel Core i3, 3.06 GHz, 4 GB, SMC 1.64f5
Graphics: ATI Radeon HD 4670, ATI Radeon HD 4670, PCIe, 256 MB
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.55.4-P2P
Bluetooth: Version 2.5.0f17, 2 service, 19 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST3500418AS, 500.11 GB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 4
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 5

24 imac screen freeze hard drive reinstall&hardware test ok

24 imac screen freeze hard drive reinstall&hardware test ok

Do you have a question? If so please ask it and provide more information. If English is not your native language please use Google Translate .

What up with all the screen freezes since the updates?

What up with all the screen freezes since the updates?

Sorry to say your installation must have been unsuccessful.
A normal installation would not do this.
Uninstall, run the cleanscript* and try again (maybe your AV is too agressive).
*http://www.adobe.com/support/contact/cs4clean.html

Every time i sync in my music in my iphone 5 it would have to back up my iphone and every time i back up the loading bar would freeze then my itunes with crash pls help my iphone 5 coat a lot from my savings

every time i sync in my music in my iphone 5 it would have to back up my iphone and every time i back up the loading bar would freeze then my itunes with crash pls help my iphone 5 cost a lot from my savings

Syncing requires a backup as part of the sync process.
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IMac freezes since 10.4.9 Update, corrupts disk every time

Hi. I would call myself a fairly experienced Mac User (6+ Years Exp, multiple Systems & Laptops, etc.) but my one week old 24'' iMac is making me sick ...
I got the System on Monday and it worked fine till the 10.4.9 Update. That can be coincidence, but maybe not:
It freezed since then 3 times with the same symptoms:
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- keyboard can't do a force quit
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This would be okay, if there wasn't this bad pattern:
When forced to reboot 2 times it rebooted, one time it didn't
But all times the boot disk couldn't be fixed with disk repair!!!
Disk-repair showed two different errors:
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- Volume Header damaged ("Volume Header beschädigt")
The last one apperead two times and one time the disk wasn't bootable since it would only mount read only (checked with verbose booting)
I got the first one repaired finally by mounting the system in Target Mode on my macbook and running fsck_hfs with rebuilding the b-tree.
My trust in "stable" working on this iMac is down to zero. I will now try to reinstall the system the 4th time and then stay with the 10.4.8 version until the error happens again ... then I guess its time for apple care.
(BTW: Yes, I ran Hardware Test in extended Mode about 10 times - nothing. Smart Status of the drive is okay. No Extensions installed, just plain software with office and Adobe Programms)
Strangely, this post looks somehow similar: http://discussions.apple.com/thread.jspa?threadID=891369&tstart=0
Any other ideas? Thank you for your time in advance...
24'' Intel-iMac 500GB/2GB/256MB Mac OS X (10.4.9) Fresh install, then 10.4.9 Update.

It happened again.
These are the german results from checking the internal harddrive by the disk tool via firewire target mode:
Ungültiger Volume-Header
HFS+ Volume wird überprüft.
Zusatzdatei für Dateiaufbau wird überprüft.
Katalog wird überprüft.
Multi-Link-Dateien werden überprüft.
Kataloghierarchie wird überprüft.
Datei für erweiterte Attribute wird überprüft.
Volume-Bitmap wird überprüft.
Volume-Informationen werden überprüft.
Ungültiger Zähler für freie Blöcke
(„59742460“ sollte an Stelle von „59742459“ stehen)
Das Volume „Safe Harbour2“ muss repariert werden.
Fehler: Der zugrundeliegende Prozess meldete einen Fehler beim Beenden.
24'' Intel-iMac 500GB/2GB/256MB Mac OS X (10.4.9)

IMac screen freezes

Hi my iMac late 2009 27 inch has started to have a fault.
Randomly the screen freezes with little pixelated blocks. The mouse cursor still moves around but I can not click onto anything. I have to pull the power lead out to turn off.
Its running osx 10.8.4 and is a intel 2.66ghx i5 model with Radeon HD4850
Heres image
http://img51.imageshack.us/img51/5599/x9ub.jpg
http:/http://imageshack.us/photo/my-images/51/x9ub.jpg/
any help would be great

mende1 wrote:
The GPU is one of the cheapest parts of your computer, so that repair may cost between $100 and $200
But isn't the GPU a part of the logic board? So it'll be a logic board replacement then..? or is 2009 different?

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I have 2 iMacs. My wife's is 2008 3.06 Ghz 24" model with Snow Leopard. Just updated to 10.6.7, and on re-boot we entered perpetual grey screen freeze ups. Followed guidance from support article - specifically to remove peripherals (attached were 2 USB devices - HP inkjet printer and WD 500G portable HD used as Time Machine. Also connected to LAN via RJ-45) After re-boot I changed network to airport to access LAN. When I re-inserted ethernet jack the grey screen immediately came up. Tried various combinations and ethernet connect always kills machine. Any ideas? I'm holding off on 10.6.7 update for other iMac.

Because I've had strange problems with past system update downloads, I now always get my system updates from http://support.apple.com/downloads/
I always use the Update Combo version. It installs a fresh set of all previous updates as well as the new one. This gives you a fresh beginning with system 10.6.x. Since I adopted that practice, I've had no more issues with updates.

Why is my iPhone 5 freezing since the last software update?

My iPhone 5 started to freeze after the last software update for iOS 7.1.
It started shortly after when I noticed my timer would freeze and I wouldn't be able to turn it off once the alarm sounded at the end. Usually I can reverse the freeze by pressing the off button.
However, this morning I visited several webpages embedded in emails and after about the 5th webpage, the phone locked and the last webpage I visited lightly flashed and kept recycling. Pressing the off button didn't help this time. I finally plugged it in to recharge and after an hour or so, it returned to the normal menu settings after putting in my password.
The problem seems to be getting more frequent.
Has anyone else had problems with their iPhone 5 freezing?

Thanks for the suggestion but I tried that first and it didn't bring up the apple logo as it should have.
I haven't tried "restore" yet but I guess that will be my next move when it freezes again.
(Several friends have mentioned their iPhones are freezing now too after the last software update so this problem could get bigger.)

HT4623 Updating to IOS and stuck on Rescue Email? Says optional email address to confirm your I.D. or reset a P/W but with or without typing an email address cannot move to Next screen or even cancel??? Pls help.

Updating to IOS and stuck on Rescue Email? Says Optional email address to confirm your I.D. or reset password but with or without typing email address in, cannot get past screen. Click on enter or Next and nothing happens. Cannot even cancel update. Pls help a.s.a.p. Thank you.

Updating to IOS and stuck on Rescue Email? Says Optional email address to confirm your I.D. or reset password but with or without typing email address in, cannot get past screen. Click on enter or Next and nothing happens. Cannot even cancel update. Pls help a.s.a.p. Thank you.

IMAC screen freezes and goes blue....

this just started yesterday - I did not add any programs or update any software recently. I have since added Norton and scanned for viruses.
PROBLEM: my system freezes and the screen goes blue. It does not "wake" back up right away and after it goes blue a few times, it stays blue and I have to hard boot. If I leave the system off for about an hour, I'll get a few hours out of it before this happens.
DIAG: As stated above, I checked for viruses. I also ran all available diagnostics, and am fresh out of new ideas. Since I can't open my iMac without voiding the warrantee, I can't check for any possible burst or bulging capacitors. I disconnected all perperials and still have the same issue.
HYPOTHESIS: I am heavily leaning toward a hardware problem, but before I take the trip to the Apple store, I wanted to reach out to the forum to see if anyone else has had this problem?
This is an early 2006 Intel based 20" iMac that I have been running (24x7) since late August 2006. I never had an issue with my first iMac (pre-Intel).
HELP!!!
intel IMAC 20" Mac OS X (10.4.8)

silentpartner,
Unless your issues match a known problem, (wouldn't appear too likely if no result from the Apple Hardware Test) before Apple will accept your iMac for hardware repairs, you'll have to prove it's not a software issue by reinstalling the OS. FWIW, if it's a hardware issue and in particular if the hard drive needs replacing, you'll want to back up your important data anyway, prior to turning it in for any repair.

2008 24" iMac screen freeze issue? Is there a recall?

Hello, I have a late 2008 24" imac 2.8ghz ati 2600 running mavericks, sometimes i get solid colors or rainbow paterns or other digital artifacts that freeze and require a hard boot. Is this a recall issue? there seems to be many with this problem, no kext work, Clean installed downgrading OS, pram flashing or any other solution seems to work, it doesnt seem related to heat and happens seemingly at random whether iunder load or not. It's done this since I got it but I was stationed overseas and nothing could be done at the time, of course now I'm a full time student on a fixed GI stipend and can't replace my computer. If so many people have this issue, and it appears to be hardware/manufacture related, why can I find nothing about a recall?

Hello, I have a late 2008 24" imac 2.8ghz ati 2600 running mavericks, sometimes i get solid colors or rainbow paterns or other digital artifacts that freeze and require a hard boot. Is this a recall issue? there seems to be many with this problem, no kext work, Clean installed downgrading OS, pram flashing or any other solution seems to work, it doesnt seem related to heat and happens seemingly at random whether iunder load or not. It's done this since I got it but I was stationed overseas and nothing could be done at the time, of course now I'm a full time student on a fixed GI stipend and can't replace my computer. If so many people have this issue, and it appears to be hardware/manufacture related, why can I find nothing about a recall?

HT5457 ipad unlock screen freezes since updating ios

Since updating to IOS6 on my 3rd gen iPad, every other time I power on the "unlock" slider bar freezes, shuts down and when I press the "hard" power button on again it's unfrozen and I can again slide to unlock. This is frustrating. Anyone have any insight or have this same problem since updating?

(A) Reset iPad
Hold down the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears
Note: Data will not be affected.
(B) Reset all settings
Settings>General>Reset>Reset all settings
Note: Data will not be affected but settings will be reset.

24" iMac Screen Freezes since 10.6.3 update - pls help!

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