MacBook Pro crashed: loading midway goes black

Hello!

My MacBook Pro randomly turned off, and won’t start.

Any button push leads to logo and loading bar, which at midway disappears into black screen.

There is no chime, the only sound comes from battery plug in. Tried it all:

1. checking battery
2. unplugging accessories
3. pushing power button for 15 sec, letting go and pushing again
4. pressing all kind of combos: shift didn’t work, diagnostics shows no error, disk utility aid shows no error, nvram combo no effect, scm no effect.

All it does is tries to load and midway crashes and turns into black screen.

No sound of fan working (only when running diagnostics).

laptop never fell, never overheats, always used with care, and not even a year old!

please help