Why does my car radio not have any sound?

I have a 1999 Mercedes-Benz C280 with an aftermarket radio my brother put in. He lives 5 hours away and isn t answering his phone and I d like to get this figured out before I leave town. The radio turns on, changes stations and inputs and everything but there s no sound in the speakers. Any idea as to why? I tried... show more I have a 1999 Mercedes-Benz C280 with an aftermarket radio my brother put in. He lives 5 hours away and isn t answering his phone and I d like to get this figured out before I leave town. The radio turns on, changes stations and inputs and everything but there s no sound in the speakers. Any idea as to why? I tried to look it up on youtube but all i saw were actual installations. I was told I needed to buy a speaker and a speaker box to wire the radio to, and i did that. Now what?! help please!!
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