I've got the base PC game and the stereos I bought have all lost sound. (I don't have any mods and haven't used cheats - so far - lol) I'm annoyed since the music is something I really enjoy. I bought the cheap one and it worked at first. Then suddenly stopped. The animation works, and the sims still get the enjoying music moodlet (I don't, lol). I sold it for a more expensive version and that didn't work either. I sent my sim round to another sim's house and their stereo worked! Pah!
I'm not aware of what was happening when it stopped, but it happened early on in the game. I haven't put any custom music in the game. Anyway, I'm glad they still get the moodlet, but I really miss the music. This is my first PC game, I have a couple and I'm saving up so they can move (I also have the Xbox version).
I asked EA by email, and they said they couldn't help because it sounded like a gameplay issue, and I should ask in forums. I wish EA email CS was more helpful, you have to specify which game you are asking about, which makes you think they can do more than just general tech help. But I guess they have a lot to deal with. From the reply I got it certainly sounded like that. I've so far had a lot more luck with the live chat. So, like they advised, I'm asking in a forum...