iTunes playing music but no sound

[Hustle]

Hi. I was listening to music in iTunes and browsing the iTunes store. I purchased a song and once it had finished downloading, i went to play it and there was no sound but the song was showing as playing. I tried playing some other songs, but none are making any sound now.

I haven't a clue what's wrong. Its not my Macbook as there's volume when watching youtube etc...

Anyone got any ideas?

P.S I've tried restarting and it didn't fix anything

 

[WildCowboy]

Dumb question: You didn't happen to move the iTunes volume slider all the way down by accident, did you?