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Hi there and welcome
Can you please remove the power cable from the thinkpad and then hold the power button for 60 seconds then release.
Then connect the power cable, power it on and tell me if it then chargers please.
Is it still turning on?
The battery then has faulted it is flashing as it cannot communicate with the battery for charging.
Residue power can cause this but we just rulled this out
You will need to purchase a replacement one and can do so via my link below
It will then allow the battery to charge again
If you would like any additional information or assistance, please do not hesitate to let me know.
and if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.