Youtube videos wont play?

my brother just downloaded Google chrome and i noticed that i cant play any music videos or sounds besides i tunes. i checked the speaker plug and there in tight and i just got new speakers. and when i go on youtube the whole bar that says play and pause aren't there and the picture is blank. can anyone tell me... show more my brother just downloaded Google chrome and i noticed that i cant play any music videos or sounds besides i tunes. i checked the speaker plug and there in tight and i just got new speakers. and when i go on youtube the whole bar that says play and pause aren't there and the picture is blank. can anyone tell me what i'm doing wrong or how to fix it?
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