I think ibkNhubert got it right, I’m just including a link to a much more detailed post I’ve made about this issue: Laptop won't power on unless i plug in AC power - #216 by Tom1
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I think ibkNhubert got it right, I’m just including a link to a much more detailed post I’ve made about this issue: Laptop won't power on unless i plug in AC power - #216 by Tom1