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.
Is Apple going to come out with a fix or are we going to eternally suffer indefinitley.

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

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When I reboot and run the 'D' hardware tests, no problem is discovered.
According to iStats, the computer's temperature seems fine (HD: 52°C, CPU: 46°C, ambient: 23°C, GPU diode: 59°C, GPU heatsink: 58°C, memory controller: 51°C, power supply: 64°C), as do fan speeds (optical drive: 999rpm, hard drive: 1125rpm, CPU: 937rpm).
As a matter of interest, this started happening two days ago after the computer locked up while playing Starcraft 2 and I had to hard-reboot. At the time I was (and still am) running 10.6.4; I'd installed the Snow Leopard Graphics Update on August 31st.
I'd be very much obliged for any thoughts and input, as - unless I'm mistaken about the hardware somehow - the usual suspects aren't appearing (i.e. a rogue process, overheating, broken fan, etc.).
If I were to guess, I'd suspect a problem with the scheduler, but I don't know that much about Darwin to test.
Thank you kindly for any thoughts and suggestions.
Brian

Hi, when I had that type of issue on my C2D the HD was the cause..
You could have either the Apple Genius's or your local Apple Approved Service Agent take a look & run some tests..Their testing programs are more vigorous than techtool... Have you rebooted holding down the D key, (D=Diagnostics)? it has 2 levels, try them both...L
Message was edited by: elmac

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Hello,
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
Open Activity Monitor, Show:>All Processes, sort on CPU%, see if anything using too much CPU% when this happens, click on Memory tab, do you have many Pageouts?
Open Console in Utilities & see if there are any clues or repeating messages when this happens.

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