Laptop will not boot, LED on charger turns on

Hi There,

Recently my Surface Laptop 3 seems to have died. It will not power on no matter what I try.

I've tried booting into the UEFI with ctrl+F4+power button held for 20s.

When I plug the charger in, the charger LED comes on, but I noticed after holding the above combination, around 15s the LED will flash once, but the laptop won't boot.

Does anyone know what the problem might be?

Thanks,

M