Black screen during playback (1 Viewer)

[jesterino]

During 30 minutes playback of movies (Divx or Mkv) the screen become black like a screen saver for unusing and i can hear only audio. For restore it i have to push mouse or keyboard button. No remote control keys work for make it play
I checked all settings on windows (screensaver and power managment) and in MP too, but all is disabled. If i play
on Mediaplayer or MPC i got no trouble.

Any suggest?

TV-Server Version:
MediaPortal Version: Latest
MediaPortal Skin: Blue-Two Wide
Windows Version: Vista Premium 32bit
CPU Type: Dual Core duo 2,00
HDD: WD SATAII 320 GB on SilentMaxx Case
Memory: 2 gb DDR II
Motherboard: ASUS Barebone T3
Motherboard Chipset: Intel
Motherboard Bios:
Video Card: Nvidia 8600 GTS
Video Card Driver:
Sound Card: Asus Barebone T3 7 ch
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppauge WinTV
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: FFWVideo
MPEG2 Audio Codec: AC3Filter
Satelite/CableTV Provider:
HTPC Case: ASUS BAREBONE t3
Cooling: SCYTHE Andy Samurai Master
Power Supply: Seasonic S12II 430W
Remote: Logitech Harmony 1000 (MCE remote emulation)
TV: SONY KDL-46X2000 46" FullHD
TV - HTPC Connection: COMPONENT 1080i