MBP 15" 2,5GHz, 8600GT - OpenGL problem or graphic problem?

[TiborMan]

Hi,

i need some help with my MBP. In Leopard was all OK, but few days when I want instal snow leopard I have big problem with iMovie, effects and all transitions are BLACK !!! Now I discovered that the problem is even in itunes visualization. Some visualization in itunes have same problem, black effects and black renders smoke, light I think. Have anybody same problem and solution?

EDIT: after installing SNOW LEOPARD the same problem

HERE some screenshots:

http://www.flickr.com/photos/42304218@N08/4262349500/
http://www.flickr.com/photos/42304218@N08/4262349826/

My MBP graphic card:
NVIDIA GeForce 8600M GT:

Chipset Model: GeForce 8600M GT
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0407
Revision ID: 0x00a1
ROM Revision: 3212
Displays:
Color LCD:
Resolution: 1440 x 900
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Display Connector:
Status: No Display Connected

I apologize for my English but I hope you understand the text.

Thank so much.