Sennheiser PC155 headset prevents booting of Knoppix

If I have my Sennheiser PC155 USB headset pluged in during Knopix 5.1.1 DVD Version boot it fails to find the Knoppix file system on HDA and dumps me into a limited shell

If I unplug and reboot all is OK.

Is there a cheat code to allow me to boot with the Headset attached?

The system is a Dell 8400 with Intel Raid in Raid 1 config. Knoppix -finally- recognizes the raid array and loads the HD's just fine (with the headset dettatched).

So far I very much like Knoppix 5.1.1

JP