My Macbook keeps going black like it has shut down but it is still turned on. What is happening?

I have a Macbook purchased in 2008 and it keeps going black on me as if it has been shut down. When I hold it up to a bright light I can see it is on but  it is so dark I can't see anything. Does anyone have any ideas what is happening?

Try Resetting the System Management Controller (SMC)

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    Anonymous UUID:  
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    Tue Jun 17 18:27:35 2014
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    RSP: 0xffffff8025236e50, RBP: 0xffffff821104bf80, RSI: 0x0000000000000000, RDI: 0xffffff8047aa3780
    R8:  0xffffff8205de5078, R9:  0xffffff8205e60068, R10: 0xffffff821104bd90, R11: 0xffffffffffffffff
    R12: 0xffffff80476ae280, R13: 0xffffff8047b45140, R14: 0xffffff8205de5000, R15: 0xffffff8047b45168
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    0xffffff821104bce0 : 0xffffff80252dbf5e
    0xffffff821104beb0 : 0xffffff80252f3456
    0xffffff821104bed0 : 0xffffff821104b6e0
    0xffffff821104bf80 : 0xda950000
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    Backtrace terminated-invalid frame pointer 0xda95f170
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    13D65
    Kernel version:
    Darwin Kernel Version 13.2.0: Thu Apr 17 23:03:13 PDT 2014; root:xnu-2422.100.13~1/RELEASE_X86_64
    Kernel UUID: ADD73AE6-88B0-32FB-A8BB-4F7C8BE4092E
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    Kernel text base: 0xffffff8025200000
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    com.apple.driver.AudioAUUC
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    com.apple.driver.AppleGraphicsDevicePolicy
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    com.apple.driver.IOPlatformPluginFamily
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    3.6.0
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    3.1.7
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    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x802C, 0x31364B545331473634485A2D314736453120
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    Serial ATA Device: MATSHITADVD-R   UJ-8A8
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  • Black screen and random shut down

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    Restart your computer.
    Thank you for using Apple Support Communities.
    Take care,
    Sterling

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    A new Mac comes with 90 days of free tech support from AppleCare.
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