It runs ok on ac power , the green battery light is on as if the battery is charging but if you look at the power monitor or bios it says no battery present and if you remove ac it shuts off instantly, the battery has been replaced already and contacts look good.
Remove battery check if laptop works fine with ac adapter, if not then download the latest bios version first if fails then replace ac adapter. If laptop works fine with ac adapter. but cannot work with battery alone, download the latest bios then charge the battery for 6 hrs. if still batt not charging then replace batt. but as you mentioned you already replaced the batt and your still getting the same issue. replace motherboard.
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