I recently have to use a recovery partition, becouse of windows black screen issue (while this, notebook has been...

Suddenly, after 10 years this weird behaviour stopped. I can’t tell real solution, but it can be related to an adapter I made to use USB-C to charge it. I have a unadequite charger which can’t sustain 20V 3A so adapter kept pausing a charge process for 3s or more and started charging again. This is the only thing I did recently and by my supprise it can now shut down, sleep and hibernate by itself… I’m happy and confused.

Re-format it using key combination while powering on.

Replace phonecall/buzzer speaker.