hello, i have a problem. Every time I launch any game on my computer i hear the sound but my screen is black. i downloaded the latest directX, and the latest driver for NVIDIA GeForce GTX 260 with 896 MB. my screen is BenQ 22 inches and my resolution is 1920 by 1080. please help as soon as possible. I am not an expert with the computers so please explain how to do if you know the answer. thank you in advance.