Macbook pro screen has black and white squares

I have an older 2007 15" MacBook Pro. I turned it on one day and, although the computer made the same sounds it always does when it is booting up, the screen showed these very depressing black and white squares, and the rest of the pixes around these blocks (half black, half white)  were very scrambled.  A few days later the computer booted up completely normally, but now it is back to the crazy screen.
Does anyone know what this problem may be? I am currently in Thailand and am wondering if someone can help me figure out what problem this most likely is so I can decide how much an appropriate repair should cost.
Thanks so much!

Hi if the device is a Macbook pro 15 inch mid 2010 model then there might be a chance of replacement of MLB for NVDIA graphic problem, please contact an apple authorised service provider for more details about this issue and you may get a free replacement programme for this MLB also all the best.....

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    Mac OS version:
    10K549
    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
    System model name: MacBookPro6,2 (Mac-F22586C8)
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    unloaded kexts:
    com.apple.driver.AppleUSBUHCI          4.2.0 (addr 0x142d000, size 0x65536) - last unloaded 116956345612
    loaded kexts:
    com.cisco.nke.ipsec          2.0.1
    com.apple.driver.AppleHWSensor          1.9.3d0 - last loaded 41916550158
    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AGPM          100.12.31
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
    com.apple.driver.AppleMikeyDriver          2.0.5f14
    com.apple.driver.AppleUpstreamUserClient          3.5.7
    com.apple.driver.AppleMCCSControl          1.0.20
    com.apple.driver.AppleHDA          2.0.5f14
    com.apple.driver.AudioAUUC          1.57
    com.apple.driver.AppleIntelHDGraphics          6.4.0
    com.apple.driver.AppleIntelHDGraphicsFB          6.4.0
    com.apple.driver.SMCMotionSensor          3.0.1d2
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleGraphicsControl          2.10.6
    com.apple.kext.AppleSMCLMU          1.5.2d10
    com.apple.GeForce          6.4.0
    com.apple.driver.AppleUSBTCButtons          201.6
    com.apple.driver.AppleUSBCardReader          2.6.1
    com.apple.driver.AppleIRController          303.8
    com.apple.driver.AppleUSBTCKeyboard          201.6
    com.apple.BootCache          31.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.iokit.SCSITaskUserClient          2.6.8
    com.apple.iokit.IOAHCIBlockStorage          1.6.4
    com.apple.driver.AppleUSBHub          4.2.4
    com.apple.driver.AppleFWOHCI          4.7.3
    com.apple.driver.AirPortBrcm43224          428.42.4
    com.apple.iokit.AppleBCM5701Ethernet          3.0.5b8
    com.apple.driver.AppleEFINVRAM          1.4.0
    com.apple.driver.AppleSmartBatteryManager          160.0.0
    com.apple.driver.AppleAHCIPort          2.1.7
    com.apple.driver.AppleUSBEHCI          4.2.4
    com.apple.driver.AppleACPIButtons          1.3.6
    com.apple.driver.AppleRTC          1.3.1
    com.apple.driver.AppleHPET          1.5
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.3.6
    com.apple.driver.AppleAPIC          1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
    com.apple.security.sandbox          1
    com.apple.security.quarantine          0
    com.apple.nke.applicationfirewall          2.1.14
    com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
    com.apple.driver.AppleProfileReadCounterAction          17
    com.apple.driver.DspFuncLib          2.0.5f14
    com.apple.driver.AppleProfileTimestampAction          10
    com.apple.driver.AppleProfileThreadInfoAction          14
    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.nvidia.nv50hal          6.4.0
    com.apple.NVDAResman          6.4.0
    com.apple.iokit.IONDRVSupport          2.2.1
    com.apple.iokit.IOGraphicsFamily          2.2.1
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.8
    com.apple.iokit.IOUSBMassStorageClass          2.6.7
    com.apple.driver.AppleUSBMultitouch          207.7
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289.1
    com.apple.iokit.IOStorageFamily          1.6.3
    com.apple.driver.AppleACPIPlatform          1.3.6
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.3.0
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    Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports
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    Serial ATA Device: MATSHITADVD-R   UJ-898
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 5
    USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0xfa113000 / 8
    USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0xfa120000 / 4
    USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfa130000 / 3
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000 / 4
    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000 / 3

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    Thank you for using Apple Support Communities.
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