Backlight problem on MacBook

Hi,
I have a 2008 MacBook (A1181) and am having one issue that I can't seem to figure out. A few weeks ago, the backlight started giving me problems. Specifically, it would shut off. Apple wanted $300 to fix it and I'd rather just get a new computer at that point, so I thought I'd try and fix it myself. If I break it, oh well.
Anyway, I ordered a new backlight inverter board and an inverter cable, but the problem persists. If I leave the computer alone completely, the backlight turns on after about a minute of sitting at the login screen. However, as soon as I touch a key/move the mouse, it shuts off. If I wait again, it comes back on a minute or two later, but then the same thing happens.
I've tried an external keyboard and have gotten the same results.
Any ideas at all what could be causing this? Or is the hardware just messed up?

Go to Apple Menu / About This Mac. Click on More Info ... next on System Report. In the left hand column, under Hardware, select USB. The right side will show the USB Device Tree. Look through that and check for "Built-in iSight". That is your camera. If it is not listed the camera is not working.
For backlighting, try this: go to System Preferences / Keyboard. Uncheck "Adjust keyboard lighting in low light".

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EtreCheck version: 2.1.8 (121)
Report generated March 21, 2015 at 11:35:35 AM EDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (15-inch, Late 2008) (Technical Specifications)
    MacBook Pro - model: MacBookPro5,1
    1 2.4 GHz Intel Core 2 Duo CPU: 2-core
    2 GB RAM Upgradeable
        BANK 0/DIMM0
            1 GB DDR3 1067 MHz ok
        BANK 0/DIMM1
            1 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 59
Video Information: ℹ️
    NVIDIA GeForce 9400M - VRAM: 256 MB
        Color LCD 1440 x 900
    NVIDIA GeForce 9600M GT - VRAM: 256 MB
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 0:13:37
Disk Information: ℹ️
    Hitachi HTS543225L9SA02 disk0 : (250.06 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 249.20 GB (168.91 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    HL-DT-ST DVDRW GS21N
USB Information: ℹ️
    Apple Inc. Built-in iSight
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple, Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
Gatekeeper: ℹ️
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    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.kodak.BonjourAgent.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [running]    com.sophos.uiserver.plist [Click for support]
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    [running]    com.sophos.common.servicemanager.plist [Click for support]
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    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
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    Dropbox    Application (/Applications/Dropbox.app)
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    AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 [Click for support]
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    CitrixOnlineWebDeploymentPlugin: Version: 1.0.94 [Click for support]
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    Flash Player [Click for support]
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Time Machine: ℹ️
    Skip System Files: NO
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Top Processes by CPU: ℹ️
         5%    WindowServer
         1%    loginwindow
         0%    AppleSpell
         0%    SophosUIServer
         0%    SophosAntiVirus
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    118 MB    InterCheck
    101 MB    SophosScanD
    60 MB    Dropbox
    54 MB    mds_stores
    41 MB    SophosAntiVirus
Virtual Memory Information: ℹ️
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    682 MB    Active RAM
    652 MB    Inactive RAM
    315 MB    Wired RAM
    1.49 GB    Page-ins
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