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I said test the battery, not replace it. Everybody's looking to shortcut the procedure. Now get a testlight and test the small wire on the starter. It should power up when the key is turned to "start". If you do get power there, try hitting ther starter with a hammer on the outside housing while turning the key to start. If it starts, you have a bad starter.
If you don't get any power at that wire when the key is in start, check the ignition switch, neutral safety switch (auto trans) or clutch switch (standard trans).