Grey screen comes down,PowerPC G5 freezes, restart using power button

This keeps happening and i dont know what to do..
Im on the computer doing whatever and suddenly a Grey screen or Curtain comes down and freezes my computer and a message with the Power Button icon says restart.
This happens randomly/daily no mater what program im using.
anyone knows whats happening?!!

Hi-
The machine is having kernel panics.
http://support.apple.com/kb/HT1392
There are various causes, some can be software related, some hardware related.
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8965.html
One of the better articles and troubleshooting guides follows:
http://www.thexlab.com/faqs/kernelpanics.html
A first step is to boot to Safe Mode:
http://support.apple.com/kb/HT1455?viewlocale=en_US

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    714EBD8C-083D-E200-A9BD-6F925A8F8F14
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    2.0.2 (addr 0xffffff7f84b15000, size 335872)
    last unloaded kext at 15796237223278: com.apple.macos.driver.AppleUSBEthernetHost
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    net.telestream.driver.TelestreamAudio
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    com.rim.driver.BlackBerryUSBDriverInt
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    com.apple.filesystems.smbfs
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    com.apple.driver.AppleMikeyDriver
    2.6.1f2
    com.apple.GeForceTesla
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    com.apple.driver.AppleUpstreamUserClient
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    1.60
    com.apple.iokit.IOUserEthernet
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    com.apple.driver.AppleHWAccess
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    com.apple.driver.AppleMCCSControl
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    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
    4.2.4f1
    com.apple.driver.AppleSMCLMU
    2.0.4d1
    com.apple.driver.ACPI_SMC_PlatformPlugin
    1.0.0
    com.apple.driver.AppleLPC
    1.7.0
    com.apple.driver.SMCMotionSensor
    3.0.4d1
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    com.apple.BootCache
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    com.apple.driver.AppleIRController
    325.7
    com.apple.driver.AppleUSBCardReader
    3.4.1
    com.apple.iokit.SCSITaskUserClient
    3.6.6
    com.apple.driver.XsanFilter
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    com.apple.iokit.IOAHCIBlockStorage
    2.5.1
    com.apple.driver.AirPort.Brcm4331
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    com.apple.driver.AppleFWOHCI
    5.0.2
    com.apple.driver.AppleUSBHub
    666.4.0
    com.apple.driver.AppleAHCIPort
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    656.4.1
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    com.apple.driver.AppleHPET
    1.8
    com.apple.driver.AppleACPIButtons
    2.0
    com.apple.driver.AppleSMBIOS
    2.1
    com.apple.driver.AppleACPIEC
    2.0
    com.apple.driver.AppleAPIC
    1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient
    217.92.1
    com.apple.nke.applicationfirewall
    153
    com.apple.security.quarantine
    3
    com.apple.driver.AppleIntelCPUPowerManagement
    217.92.1
    com.apple.AppleGraphicsDeviceControl
    3.5.26
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    1.0
    com.apple.driver.DspFuncLib
    2.6.1f2
    com.apple.vecLib.kext
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    8.2.4
    com.apple.nvidia.classic.NVDAResmanTesla
    8.2.4
    com.apple.iokit.IOAudioFamily
    1.9.7fc2
    com.apple.kext.OSvKernDSPLib
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    com.apple.driver.AppleSMBusController
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    4.2.4f1
    com.apple.iokit.IOFireWireIP
    2.2.6
    com.apple.driver.IOPlatformPluginLegacy
    1.0.0
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    com.apple.driver.IOPlatformPluginFamily
    5.7.0d11
    com.apple.iokit.IONDRVSupport
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    2.4.1
    com.apple.driver.AppleSMC
    3.1.8
    com.apple.driver.AppleUSBMultitouch
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    USB Device: Built-in iSight
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    USB Device: IR Receiver
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    Network Service: Wi-Fi, AirPort, en1
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    Serial ATA Device: MATSHITADVD-R   UJ-868
    USB Device: Built-in iSight
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