Okay i suck at this stuff ...please helpppp!

okay so i just got this new pioneer sterio system for my 18th birthday and it has this ipod hookup on it, and i have an ipod mini and i tried to hook it up and when i did it like works, like the name of the song i’m trying to play pops up and it connects right and everything, so i know it’s not the cord, but the sound won’t work …like my speakers won’t play it. but they like work normaly with like cd’s and stuff. and i know it’s not just my ipod because i’ve used it with like 4 different ppl’s ipod’s and i just don’t know what to do!!
please help
thanks ya’ll

Did you select the “Ipod” or “Aux” input on your stereo system?

yeah i put it on ipod