Have you tried a different charger? Over the years I've had many chargers die. But only once did the actual laptop refuse power from a perfectly functioning charger.
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Check with Lenovo. They had a large number of Thinkpads with bad usbc ports. They might cover it outside of warranty.
A really long time ago they had a bios bug where if you did a battery test it would never end the test and be stuck with a turned off charge port and a dead battery, with no way to turn the test off.
yup, I've got 3 that have worked on the laptop in the past but none of them even light up the power LED (they work for my other laptops and devices). Weirdly, since posting this it seems to be charging on its OG charger after dumping the static for nearly 5 minutes and leaving it to its own company
Try hitting the port and charger with some contact cleaner (computer off, charger unplugged).