I'm pretty sure it was some version of snow leopard, not sure of the exact version number. I don't remember ever putting Lion on it. It had the bad GeForce graphics. I actually have the same card working in my desktop (tonycrap mid 2010 MacPro) under Lion (and previously Snow Leopard).
I replaced the Intel wireless card (WM3945ABG) with a AR5BXB72 out of my old MacBook Pro. However, Snow Leopard will not recognize it. Any help would be greatly appreciated. This laptop has a T2300E Core Duo and the latest A10 bios.