no sound on my computer
First check to see volume control is turned all the way up
reinstall driver for your soundcard
if it still doesnt work, contact warrenty provider (if you have one) and you may need a new soundcard
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It's most likely your sound card, try a friend's one (if they'll let you) just to see.
yes i have external speakers yes tested with earbuds even changed speakers dont really know nothing has changed.
What precipitated the problem? Do you have external speakers? Have you tested with earbuds? What OS? When did you last have sound? What has changed recently?