SOURCE: panisonic toughbook cf27 wont turn on
Hi, Try disconnecting the power completely and also take the battery out then wait for a minute then put the battery back in then the adapter and give it a try.... if still no luck try again while looking at the indecator lights and see if any light flashes... also sometime the power plug gets loose inside. or the power adapter dies... I would try gently weglling the power plug while looking at the lights if anything happen then it is the plug. if nothing then I would try to test the adapter either by a multimeter or borrowing another adapter and seeing what happend... if still nothing then it is the main board itself... best of luck
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