Mac Book Pro 2.2 (2008) Core 2 Duo, display and trackpad stopped working
my 2008 santa rosa 2.2GHz MacBook Pro has suffered both the graphic chip problem (no picture on screen but accessible through screen sharing apps or ext monitor), and the trackpad cable problem (no response from keyboard or trackpad although ext mouse and keyboard function ok). Both are common faults on this model. Graphics prob repairable under the special warranty extension from Apple. Trackpad cable fairly easy using ifixit.com guide.

When my graphics card was in broken mode, (it was intermittent), it would not show up in the Graphics/Displays section of System Information (Lion); the Intel chipset would show up there instead; so thus you can check if you have the graphics chip (poor solderflow) problem. It would however give me the output to an external monitor ok (?!*)

It sounds as though you might have suffered both at the same time...although your ext mouse should work(?!*)