Problems with sound

So i just got a new Logitech G510 keyboard and my pc will let me use the headphone jack just fine i can hook my speakers up and it works. however when i try to go off the back jacks on my mobo with my speakers i don't get any sound. I tryed all the jacks and got no sound, The eq moves but i hear nothing.


Its Realtek and all the software/drivers are installed.

have you tried resetting your default "playback device" back to your speakers and not the headphone jack?