ThinkPad E14 Gen 3 won't turn on

Hey guys. I've had a E14 Gen 3 (Ryzen 5500u) for a few years now, always worked as expected, no problem at all.

But, last night I was using it unplugged when the battery completely discharged. As soon as that happened, the laptop shut off screen etc. But, for some reason, the fan didn't stop spinning. Actually, started spinning faster in a way that I never seen it, and that lasted a few minutes till it was completely turned off

After that, the laptop simply won't turn on. Tried turning on plugged and unplugged, but didn't work at all. I've let plugged for the entire night so I could be fully charged, but still didn't work by morning. The power button LED turns on, but keyboard lights don't, and also the fan doesn't turn on too.

I've tried removing the extra ram stick and didn't work as well, tried cleaning up and changing thermal paste but none of that worked. Do you guys have any ideia of whatsoever caused this? And how to solve it?