Thinkpad T42 AC conection led always on

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after charging my T42, for a time whith an DC to AC converter in the
car (12v DC to 110v AC) for a while and after a few problems with it
( the power goes on an of for a few tieme), now the ac led remin
always on no matter if it is pluged  to the wall or not.
I thnk that a hard reset wolud fix it, what do you think about... how
to do  a hard reste? in a Thinkpad ... do you have an other clue?

All funcion are ok and the laptop charge well, and works with the
battery, but the LED never turn off.

Thank in advance for your clues.


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