A Toshiba laptop I encountered recently was deemed “possibly dead”. It would not boot and screen was just black.
A blinking green LED was present, meaning the battery is discharged. Further investigation revealed that the power supply electric cord had fallen out of the socket.
Plugging it in again turned the blinking green LED to solid orange, meaning the laptop was charging and just pushing the power button made it boot up normally.
Sometimes the problems are too simple 🙂