A few angles:

  • Charger wattage too low or failing; test with a known-good.
  • DC jack damage or loose internal connection.
  • Battery wear level high; check with OEM utility.
  • Firmware/EC issues; BIOS update sometimes helps.
  • USB-C PD negotiation quirks with third-party cables.

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What it might be (likely causes)

  • Underpowered or failing charger
    Many laptops negotiate specific wattage. If the adapter can’t supply enough (e.g., using a 45 W brick for a 90 W laptop), you’ll see “Plugged in, not charging” or the battery will drain while in use.