Random Shutoff after nvidia video card replacement

This is pertaining to my Macbook Pro 15.4 inch from 2007 running Lion.
A few years ago this MBP completely crapped out. About a year later I received a notification in the mail about this big nvidia lawsuit that would allow me to have my computer fixed if the lawsuit went through. It did eventually and I got my computer fixed. However since installing Lion I've been having trouble with it randomly shutting off, making that high pitch unwinding sound, the sound it makes when you hold the power button for it to hard shut down. I checked into overheating as that seems to be an issue with Lion and MBP's and I run SMC Fan Control to the max and it still shuts off, even at low (relative) temperatures around 140 F.
The weird thing is, without SMC Fan Control the fans won't ever get cranked up, at all. They stay at 2000 rpm. I figured at this point I could rule out overheating, but that's not possible because when I put my computer on ice packs and keep the internals around 80 degrees it runs like a champ. (I'm sure that will work out great in the long run what with the condensation and all). Anyone have any thoughts? I thought about reapplying thermal paste but the temperatures rarely get above 170 when it shuts off.
Thanks

barfswagon wrote:
This is pertaining to my Macbook Pro 15.4 inch from 2007 running Lion.
Macs as late as 2011 that didn't have Lion preinstalled came with two discs, one with the os x, and the other with applications and the AHT.

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{---------- Please click the "Thumbs Up" to say thanks for helping.
Please click "Accept As Solution" if my help has solved your problem. ----------}
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I think it is a good choice.
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BACKGROUND
Hardware Overview:
Model Name:                       Mac Pro
Model Identifier:                  MacPro3,1
Processor Name:                  Quad-Core Intel Xeon
Processor Speed:                  2.8 GHz
Number of Processors:         2
Total Number of Cores:        8
L2 Cache (per Processor):     12 MB
Memory:                               10 GB
Bus Speed:                            1.6 GHz
Boot ROM Version:                MP31.006C.B05
SMC Version (system):          1.25f4
NVIDIA GeForce 8800 GT:part number 630-9898
Chipset Model:        NVIDIA GeForce 8800 GT
Type:                       GPU
Bus:                         PCIe
Slot:                         Slot-1
PCIe Lane Width:      x16
VRAM (Total):           512 MB
Vendor:                    NVIDIA (0x10de)
Device ID:                 0x0611
Revision ID:              0x00a2
ROM Revision:          3233
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SyncMaster:
Resolution:                       1920x 1200 @ 60 Hz
Pixel Depth:                      32-BitColor (ARGB8888)
SyncMaster:
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Pixel Depth:                      32-BitColor (ARGB8888)
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I worked on behalf of HP.

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http://img109.imageshack.us/img109/9318/d3zs.jpg
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