when my speakers are on i get a loud thumping noise and no other sound can any one help thanks
Probably one of your speaker jacks is making a bad contact. You
might solve the problem by unplugging your speakers and subwoofer
(if you've got one), cleaning the jacks, and working them in and
out of their holes a few times to clear away and bits of lint or
dust. If the jacks themselves are faulty, this won't help. New
wires might cure the problem, or it might be in the sound card,
where the jacks plug in. I know, it sucks. One loose wire or
contact, and you may need to get a new sound card. But try
fiddling by plugging and upplugging the jacks, and twisting them
slightly in their sockets.