Hi there and welcome.
Can you remove the power cable and then hold the power button for 60 seconds then release.
Then connect the power cable and tell me if it turns on correctly please.
I think you missed my initial message. No problem, I will repeat
Then connect the power cable and tell me if it turns on correctly please
It appears then either the Video Adapter or the screen is faulting as you indicate you hear everything else working.
When it fails to display on the screen, can you connect an external monitor and tell me if it displays the screen then please.