Ortur Laser Master 2 not engraving

Good afternoon

I recently purchased an Ortur Laser Master 2.

I managed to run it.

I can see the laser light, but it does not engrave anything.

It seems like it does not provide enough power, even if S is correctly set to 1000. (See pictures)

I also tried to adjust the focus, but no results…

Could you please help me?

Thanks

Paolo