Picture but no sound is common and there are loads of ways this could happen.
Check red and white cables haven't been swapped and are in the right places in both machines, tv and source. A good way to test is to make sure red cord is in red input on tv and that the correct AV channel is on (ie you have picture) then try each output from source (DVD player, sky, etc). If none give you joy there could be a problem with the AV channel you're using so switch to another, ie change from AV1 to AV2, and then start again.
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