No Sound! I just got back my computer from HP help to fix something and now I have no sound ...?

I have an HP Windows XP. The power slot little brass plug thing came out (for a second time) and I sent it in to HP where they replaced it. Now, I also had my memory block thing (I don't know the word) dropped and that had to be kind of shaped so it would fit back in right. Now, all that was fine, and my memory is all good and the brass plug in spot is all fixed but I have no sound whatsoever. I checked all the volumes and went through all the troubleshooting stuff they tell you to do and nothing. I know that the sound should be working because say I listen to a song, the porgram shows that it's playing and yet no sound. Could it possibly be something they took out and just didn't put back in right? I have no idea what to do besides call them again and ask. Geek Squad won't touch it because they don't sell this type of laptop. Please, anyone with help or advise would be greatly appreciated, I miss my sound ...

Answers:
Check if the sound is muted, if not re install sound driver.
try radio shack. They may not sell computers but the only people that work there are geeks. tip one of them a little cash and theyll give you all the Geek attention you crave
re-install your Media player, and see if you plug in speakers wright.

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