http://www.beoworld.org/beotech/mlsetups.htm
mostlikly you messed up the option setting. Take a look at the link above, in most cases I think option 2 should work.
You may need to give more information about your setup.
Cheers
JK
BS9000, BS2300, BC2, BL2500, BL3, Bl2, BS1, BV8, BC4, A8