Cubase SE

Hi there, my first post and a basic Cubase user. I have Cubase SE and my PC died. I have all functions working in Cubase (that I need) except hearing any audio output. The audio activity output channel shows there is an output by I cant get any audio out since I set up on new machine. I have an EMU Proteus X card. Can anyone help? pleas let me know, Ber.