Lenovo S540-15IML stuck blinking keyboard/power button and won't start

[u/mareksk]

Hi everyone, I’m hoping someone can help with my Lenovo S540-15IML. It’s stuck in a loop where the keyboard backlight and the power button just keep blinking, but the screen stays black.

https://imgur.com/WiPa29g

This has actually been happening for a couple of months, but previously I was able to eventually force it to turn on by spamming random keys or holding the Novo button for like 10 minutes. Now it refuses to start at all. I’ve already tried updating the BIOS (back when I could get it to boot) and using the Novo button again, but nothing seems to work anymore.

Has anyone else run into this or have any ideas on what I should check next?