Chosen Solution
This mac was repaired 7 months ago by Apple with a (hopefully) new logic board replacement. It has since died whilst operating google sketch up software. Not a complex model and no high quality 3D renders were being processed, it just shut off with no warning. The only sign of life left is the charging light on the Mag charger. It has not responded to any combination of shift+ alt + ctrl + power, ctrl + R + power to reset system management. Anybody got any ideas what’s wrong with it?
Well you are in a pickle here ;-{ I would go back to Apple (where you got the system serviced before) as it clearly is dead as a doornail now. But that’s likely tricky as they are closed due to the virus outbreak. You only other hope here is visiting an independent repair shop. Can you give us an idea where you live so we can aim you to someone. You may need a new logic board.