^ i don't understand exactly what you mean by "my soundcard is my speakers". But to test it, I've tried also pluging in headphones in the line in and there's still no sound - unless my headphones are also part of a soundcard? lol i dunno...
anyway here are some images that could help you (sorry if they are too big):
speakers connected to line in
General configuration
computer managment - audio drives look all good and appear running
windows audio service in ON
Audio device
speaker setup
and:
on SPDIF:
- assigned to: Output digital and analog only
Hardware (on sound manager)
Realtek AC'97 Audio
Location: PCI Bus 0, Device 19 function 0
Device is working properly