I'd start with the black capacitor. You can get another one at Radio Shack for $1 or so if you need it now, or you can order it online from Mouser or Digikey for like $.10. Get whatever farad rating it says on the cap, and the voltage can be the same as the one there now, or anything higher. Like, if it's a 330uf, 16v capacitor, a 330uf, 25v cap will work just as fine.
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