MacBook Air Unresponsive

My sister, who is not as tech-savvy as I, has brought me her device to attempt to fix. It refuses to boot up, screen is black and will not restart. I have attempted recovery mode as well. It was working fine last night. There is minor case damage.

Stats:

Year|2015

Model|13"

OS|Mac| She says it was "Sierra" so it might be 10.12.x or 10.13.x

I have done to following:

Attempted to Restart

Attempted to enter recovery mode

Attempted to open boot manager

Changed to power cord