Mag Innovision Ah-777k I Have A Mag Innovision Computer And Midiland Speakers How Do I Get The Speakers To Work On My Computer?

I have a mag innovision computer and midiland speakers how do i get the speakers to work on my computer? - mag innovision ah-777k

help, everything is connected properly, it worked yesterday and now it's not work, have been the not yesterday, they worked me please thanks