Display problem MBP 15(2.5GHz Intel Core 2 duo)

i noticed about 2 weeks ago an intermitant issue when i was using my MPB the display would suddenly lose resolution so it looked like there were many vertical lines. text would become very jagged and difficult to read. in excel, some of the cell/column borders would not appear.
the problem would usually resoved if i moved or if the computer slept, all would return to normal.
today i booted up and the display looked immediately like crap (same probem) and has not changed regardelss of how much moving, sleeping or restarting i seem to do.
i can hook it up to an external montior and it looks fine. i get no hardware failure reports at start up. dislplay info is:
NVIDIA GeForce 8600M GT:
Chipset Model:          GeForce 8600M GT
Type:          GPU
Bus:          PCIe
PCIe Lane Width:          x8
VRAM (Total):          256 MB
Vendor:          NVIDIA (0x10de)
Device ID:          0x0407
Revision ID:          0x00a1
ROM Revision:          3212
Displays:
Color LCD:
Resolution:          1152 x 720
Pixel Depth:          32-Bit Color (ARGB8888)
Main Display:          Yes
Mirror:          Off
Online:          Yes
Built-In:          Yes
Display Connector:
Status:          No Display Connected
Could this be an internal display cable problem like i had on my G4 model? i would think if it was the graphics card, it would do it to both the internal display and the external display.
this is what i am seeing now at 1440x900.

update:
the motherboard is gone and not worth the repair costs. i purchased a new MPB. this one, i may just hook up to a monitor so the kids can use it or part it out.

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