PC speakers to receiver


Sep 9, 2016
I have my 2.1 speakers connected with rca cables to my receiver (an old denon avr 590) but I can't get any sound. I've gone through the settings on the receiver and can't find anything that would be the issue. I've also tried auxiliary which work with my headphones but not the speakers. The speakers run through my sub, could that be the issue? Thanks in advance and let me know if I missed anything

heres a link to the pictures http://imgur.com/a/5rVxz
i've tried all of the red/white connections on the receiver
the aux cord was backwards i guess haha