Laptop hung up?

My laptop is relatively new, i.e. 1 week old. Now my lap has not worked for 15 minutes. And is completely black. What should I do?

Charge the battery…

It's almost fully charged

Press permanently on / off approx. 10 sec.

then battery out + power cord off

then press on / off again for 15 seconds

battery back in ---> test!

Oki thank you.

Is the thing working again?

Yes.

Super… Goal achieved!

but does not always work, with a massive hardware damage the success would have been zero.