In message , Adrian C
writes
I don't know your laptop model, but some laptop manufacturers (namely
Dell) are selling them with specific power supplies that ID themselves
to the the machine before allowing charging. Sometimes the ID pin on
the PSU connector or the equivalent on the laptop fails to connect /
breaks.

Sometimes there is no ID pin, they signal the charger serial number,
capacity etc. over the power rail.
--
Clint Sharp