I have Lenovo Thinkpad T480 (an year old) and this is the 2nd time the power button has given up on me. Power button would keep blinking but won't work, won't shut down or recover from hibernation. This is what I have tried, and what worked for me. 1. Drain the residual battery - I took the removable battery out, tried to press and hold the power button multiple times for different duration, didn't work. I even put my phone in charging from the USB to drain the power slowly, but it was taking too long. I guess there is a second battery as well inside which is behind the cover and requires screws to be removed and all. 2. Then read a suggestion online to press the tiny emergency reset hole at the bottom of the laptop. When pressed with a small paper clip pin worked in less than 10 seconds. Thanks, Micky