System keeps locking up and/or restarting

Hi there,
I'm running Yosemite 10.10.3, and recently installed a new graphics card, Nvidia GTX 980, and attached two Dell 27" 4K monitors. Everything seems to run fine, but when I leave my computer alone for several hours, I will often find it locked up. No image comes on screen, not even the CAPSLOCK light comes on. So I have to force shut down. Other times, the CAPSLOCK light WILL come on, but no images on screen. It's driving me nuts. I've got a Panic Report after the last incident (when I came home tonight), so I can paste it here if that helps.
Thanks in advance,
Erik

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panic(cpu 0 caller 0xffffff80030530aa): "!pageList phys_addr"@/SourceCache/xnu/xnu-2050.24.15/iokit/Kernel/IOMemoryDescriptor.cpp: 1484
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Kernel text base: 0xffffff8002c00000
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last loaded kext at 12001672244392: com.apple.driver.AppleUSBCDC 4.1.23 (addr 0xffffff7f84de2000, size 16384)
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com.wdc.driver.USB_64HP 1.0.0
com.apple.driver.AppleUSBCDC 4.1.23
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AudioAUUC 1.60
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com.apple.driver.ApplePolicyControl 3.4.5
com.apple.driver.AppleLPC 1.6.0
com.apple.driver.AppleUpstreamUserClient 3.5.10
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.1.4f2
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com.apple.driver.AppleMCCSControl 1.1.11
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com.apple.driver.AppleIRController 320.15
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com.apple.iokit.SCSITaskUserClient 3.5.5
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com.apple.iokit.IOAHCIBlockStorage 2.3.1
com.apple.driver.AppleUSBHub 5.5.5
com.apple.driver.AppleRTC 1.5
com.apple.driver.AppleFWOHCI 4.9.6
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com.apple.driver.AppleACPIEC 1.7
com.apple.driver.AppleAPIC 1.6
com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0
com.apple.nke.applicationfirewall 4.0.39
com.apple.security.quarantine 2.1
com.apple.driver.AppleIntelCPUPowerManagement 196.0.0
com.apple.driver.AppleBluetoothHIDMouse 175.8
com.apple.driver.AppleHIDMouse 175.8
com.apple.driver.IOBluetoothHIDDriver 4.1.4f2
com.apple.iokit.IOSerialFamily 10.0.6
com.apple.driver.DspFuncLib 2.3.7fc4
com.apple.iokit.IOAudioFamily 1.8.9fc11
com.apple.kext.OSvKernDSPLib 1.6
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.iokit.IOSurface 86.0.4
com.apple.iokit.IOBluetoothFamily 4.1.4f2
com.apple.driver.AppleSMC 3.1.4d2
com.apple.driver.AppleSMBusPCI 1.0.11d0
com.apple.driver.IOPlatformPluginFamily 5.3.0d51
com.apple.iokit.IOFireWireIP 2.2.5
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.1.4f2
com.apple.driver.AppleGraphicsControl 3.4.5
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.driver.AppleSMBusController 1.0.11d0
com.apple.driver.AppleHDAController 2.3.7fc4
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com.apple.iokit.IONDRVSupport 2.3.7
com.apple.iokit.IOGraphicsFamily 2.3.7
com.apple.kext.triggers 1.0
com.apple.driver.AppleUSBHIDKeyboard 170.2
com.apple.driver.AppleHIDKeyboard 170.2
com.apple.iokit.IOUSBHIDDriver 5.2.5
com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.1.1
com.apple.iokit.IOFireWireSBP2 4.2.2
com.apple.driver.AppleUSBMergeNub 5.5.5
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com.apple.iokit.IODVDStorageFamily 1.7.1
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com.apple.iokit.IOAHCISerialATAPI 2.5.1
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com.apple.iokit.IOUSBUserClient 5.5.5
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com.apple.driver.DiskImages 345
com.apple.iokit.IOStorageFamily 1.8
com.apple.driver.AppleKeyStore 28.21
com.apple.driver.AppleACPIPlatform 1.7
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System Profile:
Model: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 2.66 GHz, 8 GB, SMC 1.44f0
Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x859B, 0x435435313236344243313036372E4D313646
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x859B, 0x435435313236344243313036372E4D313646
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.106.98.100.17)
Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HDT721032SLA380, 320.07 GB
Serial ATA Device: OPTIARC DVD RW AD-5670S
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 4
USB Device: Keyboard Hub, apple_vendor_id, 0x1005, 0x24300000 / 3
USB Device: Apple Keyboard, apple_vendor_id, 0x021d, 0x24320000 / 5
USB Device: My Book, 0x1058 (Western Digital Technologies, Inc.), 0x1105, 0x24100000 / 2
USB Device: USB 2.0 Hub [MTT], 0x050d (Belkin Corporation), 0x0017, 0x26200000 / 2
USB Device: My Book 1148, 0x1058 (Western Digital Technologies, Inc.), 0x1148, 0x26210000 / 6
USB Device: Mass Storage Device, 0x058f (Alcor Micro, Corp.), 0x6362, 0x26270000 / 5
USB Device: USB2.0 Printer (Hi-speed), 0x04b8 (Seiko Epson Corp.), 0x0007, 0x26240000 / 4
USB Device: Eye-One display, 0x0971 (GretagMacbeth AG), 0x2003, 0x26230000 / 3
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
USB Device: DTK-2100, 0x056a (WACOM Co., Ltd.), 0x00cc, 0x06400000 / 4
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 3
FireWire Device: FreeAgent FW, Seagate, 800mbit_speed

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If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry that we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)

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--- Quote
http://support.apple.com/kb/ht1212
(...) You will need to restore your device using the computer with which you last synced it. This allows you to reset your passcode and resync the data from the device (or restore from a backup). If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present.
--- Unquote
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System keeps locking up and/or restarting

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