If the system doesn't sense the AC adapter, it will run as if on battery all the time. Yes, it could be the mainboard - but try the adapter ($35) and power jack ($25) before replacing that ($200+).
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If the system doesn't sense the AC adapter, it will run as if on battery all the time. Yes, it could be the mainboard - but try the adapter ($35) and power jack ($25) before replacing that ($200+).