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Message: <blockquote data-quote="mdbarber" data-source="post: 358031" data-attributes="member: 46710">that is down to system design some lappies use the battery as the supply  and the inverter siply as a charger, others use a switching design, quality designs will use regulated inverters.try it without the battery but as stated unless you know if this particular model will boot without it it's not much of an indicator. also remove drives as failed ones can cause boot failure, so can keyboard but doesn't draw enough power to cause led dipping on psu</blockquote>