I reistalled the driver for IO HD and now Audio Meters show a Signal. But i can only record one Channel although both channels on IO HD show a Signal. Checked the xlr cables, they are okay. When i pull out a xlr Cable freom the IO, the computer freezes and needs a restart. Then i used the audio out from the computer with adapter cables and it works, although the level is much lower so i had to push up the level at the Betacam. At least i can do my work. But i still dont know whats going on with the audio in the IO HD. Shame that there is no real support here in Germany, because i believe this is a Hardware Problem of the IO HD.
Thank you very much for your advices here in this Forum