Laptop shutting down, doing weird stuff

[Snakehide]

Hey.
My laptop has been having some weird issues. For a while it's been suffering from Kernel 4 power errors, but that hasn't happened for several weeks. Today when I got back to my room I hit the power button, and the fans and keyboard turned on but then it shut down right away, literally within a second. Tried turning it on again and it would do the same thing, then the power button would just blink periodically. Finally I held the power button down for a while then let go and the blinking stopped. At the moment it's just sitting there doing nothing, nothing is plugged into it, nothing is on. Really have no idea what's going on. Anyone have some solutions?

Specs: Lenovo Legion 5 15ARH05
GPU: 1650 Ti
CPU: AMD Ryzen 5 4600H
RAM: 32GB Crucial 3200 MB
Storage: 1x Samsung 250GB SSD, 1x WD 1 TB HDD

Appreciate the help.

(I have also posted this in the Tom's Hardware forums.)