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Q: turn the key and car won't start! lights and radio work... on 2004 BMW 325xi

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turn key lights come on, radio works, etc. but car will not start. doesn't even make a sound. tried to jump it but no luck. any suggestions?
(2) Answers
Start with a new battery, Just because the lights and radio work doesn't mean the battery is good. Your battery has 6 cells of a little over 2 volts each and if one cell shorts out it will still power some things but won't have the amps needed to engage the starter