Doesn't start properly

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Tries to start it yesterday. Started, then conked out after a few seconds. Did this 3 times in a row. Then wouldn't do anything, not even a click, just all the dash lights came on. Let it sit overnight & started right up. Have it in the shop & getting it looked at today. Any hints. Battery is fine, never had a tune up, just oil changes & lubes every 3,000 miles.