Make sure you have the latest Direct X 9.0c (has a date after it) and latest graphics card drivers.
If you get a new driver with and old directX or visa versa all sorts of wierd crud can happen!
Oh and a black screen on a laptop can be that you have put it into projector mode by accident. There is normaly a D-Sub monitor connection on laptops for plugging in a projector or external monitor. It normaly has three modes
Laptop LCD on Projector off
Laptop LCD off Projector on <-- i think you are here
Laptop LCD on Projector on
Normaly you change it by holding a "Fn" key and pressing another key labled "CRT/LCD" at the same time.
Hope that helps
DinoHunter (still no nVidia compo voucher!), CPU/GPU Benchmark, DarkFish Encryption DLL, War MMOG (WIP), 3D Model Viewer