Black screen

Bought Apple Mac book pro which arrived today.

Everything working fine. it then prompted me to update software which I started without any hesitation.

As it updated, the picture on the screen flickered between black and picture to finally completely black.

I have carried out all restart procedures but screen is still black

I am able to plug into HDMI and see picture on the tv but nothing on the mac, it brings to a reset login screen, but once I restart the computer I have the same issue of not being able to see anything on the mac but now also on the tv.

Any advice would be appreciated