gt 240 / problems with dvi->hdmi / Black screen
 

Hi,I got the gainward gt 240 512mb ddr3.Unfortunately on mac os x 10.6.8 only vga works with my TV. Connected by dvi->hdmi the television receives the signal in the supposed resolution but only shows a black screen.On my old mac mini late 2006 a signal was shown by vga and hdmi.What's the reason for my issues?Thx