T410i shuts down when power unplugged

My T410i battery indicator shows 96%+, but if I unplug the power supply it will shut down within 4 seconds, and will not power back on unless I unplug the battery for a few seconds first. In addition, the fingerprint reader stopped working at all.
I ran the Lenovo hardware diagnostics, which gave the computer a clean bill of health.
For about a week after this phenomena began I had no issues as long as I did not unplug power while the computer was on. Today it turned off for no apparent reason while I was away from the computer and will not power on no matter what I do.
Any suggested course of action??

got warranty still?
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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