WDTV gen1 dosent play movies


Until resent my wdtv gen1 has worked just fine. But now it wont play any movies.,ec avi that has worked before.
I tried system reset but no help. I see the files but when i shall play them the screen is black.
I have firmware 1.03.01.

If no movies play from network or attached device the unit has failed

I found the problem. It is a single mkv-file that made the problem. After i tried to open it , no
Other files worked.