MacBook Pro Shuts Down on Graphics Card Switch

Hello All,
Been having some fun (sarcasm) issues with my MacBook Pro (late 2007) 17" First Gen Unibody...
Recently, I had to have the Logic Board replaced by Apple because it popped - literally, audibly popped. I usually run the machine on "Better battery life..." but while working on a more processor intense project, I went to switch it to "Higher Performace."
So the computer asked to log out, i logged back in, and as soon as Finder started up, the computer went dark. I freaked out, didn't hear a "pop" this time, but it wasn't responding! Hit the power button and it rebooted just fine, but put itself back into "Better battery life..." and so i tried to switch it to full power again... signed out, signed in, and again as soon as Finder launched, blackness.
Looks like I'm going to have to take it back in - but I was curious if anyone else had an suggestions for self diagnostics or a way to check if my discrete graphics card is fried?
Thanks guys, Enjoy the Day,
-Joel

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1. Repair the Hard Drive and Permissions
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If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
If the above doesn't work then you've had a hardware failure and should take it in for repair. This could be a hard drive failure or some other hardware breakdown.

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Ahhh, enlightenment!
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Welcome to Apple Discussions!
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MacBook Pro Shuts Down on Graphics Card Switch

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