Command & Conquer: Generals Zero Hour

Probobly has something to do with your sound cord. Try unpluging it, blowing into both ports, then plug it back in.

Alternatively, rather then blowing into the ports, use of canned air will also be beneficial, as your breath carries moisture residue, which can damage the ports. 3M Dust Remover is my preferred Canned Air. Check your local Radio Shack, Staples, or Electronics Store for availability and pricing.

this happend to me to but i solved it by not pressing ALT+TAB on the loading screen, because whenever you go to the desktop whill its loading, the sound will be on until its done loading so when you get back into the game, the game dosnt know your back so it wont use sound. if this has happened, quit the whole game and start it up again and you'll have sound, so remember, don't got to the desktop until its done loading.

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Ive had that before sometimes if you go to the pause menu and change your volume it will fix itself. it sounds funny but it works!