When I try and watch a Youtube video on my Nokia N95 8GB the video plays ok but theres no sound so how do I solve this problem??

what version of the nokia firmware/software are you running?

Type *#0000# and it will tell you. latest revision for N95 8Gb is 30.0.0.18

Upgrading to this and try again

Ive already got that software mate and still got the problem

Do other applications work ok with audio/video?

Can you remove the youtube application and reinstall?

Is your phone on silent?