Whenever I want to watch a video in fullscreen in a site like youtube the screen goes black but the sound plays. Then I found somewhere that disabling hardware accelerations fixes the problem. Disabled hardware accelerations and after some time all videos get ultra choppy and laggy. I use Google Chrome which has Adobe flash player built-in, ATI Mobility Radaeron HD 4570-512mb RAM and win 7 32-bit. Thanks in advance.