No sound when i want to asseign internal sample to a pad

Hello Guys,
please help me with this one.I am new to the Sp 2400 and i have a problem. Whenever i want to asseign a sample from the internal storrage to a pad , i can hear nothing. A notice is flashing after a while saying" All sounds off". Huw can i fix this problem.please help me.

Thanks a lot .

Nere79

What output you using? Channels 1&2 or HP (headphones)?