lynx aurora16 set up

Hello everybody, brand spanking new to the forum and lots of questions, thank you in advance for all the help I’m gonna get. After a long time waiting I finally got my DAW back I’m trying desperately to get it going. All drivers in place and running but audio somehow goes to the machine internal little speakers instead of going out through the converters outputs. I’ve ran the lynx demo with the osc files and the audio comes through the main monitors fine but when I tried to play a project through the system no audio comes through, I can hear it blasting through the DAW internal little speakers. I’m running nuendo 3 , auroras 16 through AES PCI cards, please help