Hello lilo,
welcome to SN10000. I've exactly the same trouble with the same board. There's no trouble with peripheral hardware. It's definitely a BIOS-Problem. I talked about this with people from VIA Germany and they send me the Flashing-Tool and an new BIOS revision 2.01 (the installed one is 1.0).
I hopefully started to make an update...
and then:
the update-process was aborted: Flash can't be erased....
Until now I don't have a solution, but if there's one, I'll find and send a message. So long .......
rootmaster