MacBook Pro A1151 not booting up normally

The Macbook Pro in question does not always boot up properly. One of three things happen:

1) the MBP does the chime and then repeats the sound over and over again in a continuous cycle but never starts up.

2) It boots up to the apple logo and then flickers off until the entire screen goes dark. There is no video out signal to an external monitor as I attached one to the DVI port so I know its not finishing starting up. See this video I made: https://www.youtube.com/watch?v=Lvlqk7PG...

3) It starts up normally but goes dark after a couple of minutes.

I have reset the PRAM and SMC as well as tried booting from the DVD drive. None of those did anything to help

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In the vid I see a lot of screen flickering before the screen goes black. Yet the Apple logo doesn't disappear from the screen. Is that what you encountering every time? Is the system powered by a power adapter or battery when this happens and does it react differently?

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Please give us the last three figures of your serial number (located in the battery compartment).

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Last 5 digits: S1THY

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MacBook Pro 17" "Core Duo" 2.16 GHz (T2600) - A1151 w/ATI Mobility Radeon X1600 with 256 MB of GDDR3 SDRAM.

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I'm torn here on what is your problem as it appears to be a video issue so I' thinking the GPU is having a problems but the way it's reacting is not how I would expect it to.

Do you have an external bootable FireWire HD which you can connect to your system? If you do try first disconnecting the internal HD and then plug in your external drive and see if it starts up or reacts differently. If you still have your recovery CD you can use it instead of the external HD. Again disconnect the internal drive first.

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Every time? No.

As I stated one of those three situations above happens with no rhyme or reason as to which will materialize at any given attempt to turn the laptop on.

If however the screen does go dark during the boot process rather than the other two situations then yes, the Apple logo stays there until the whole thing goes dark. The MBP continues to stay powered on as it evident by the spinning hard drive but as I stated with an external monitor attached never shows that its getting a video signal so I am fairly confident that the boot process is successful

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Sean will be eternally grateful.
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