Hi! I was going for a run, but when I clicked on a song, no sound played. I've tried different headphones but nothing. I've tried compressed air, but nothing comes out so I assume it's not dust. When I press the volume buttons the headphones are detected, but no sound plays. Any ideas? It's an iPhone 4 by the way. Edit: Just tried restoring and it didn't work. I don't think it's a hardware problem. I mean they wouldn't be detected if it was right? It just happened all of the sudden. Edit 2: Now they don't even show up. It just says ringer.