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Original post by Kishore,
Text:
Verify AC power presence with MagSafe LED indicating on, or in charge state. Try booting unit only with AC adapter and with out the battery.
Inspect unit’s AC adapter and verify that cable and MagSafe connector have no damage.
Reset SMC.
Reseat battery connector and retest. If physical damages are found, replace damaged parts and retest.
Unit’s battery may be run down, or not recognized. Substitute unit’s battery with a known-good one to verify that system starts on battery. Else the issue may be with the Logic Board.
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