Why did the laptop stop working after adding a new OP plate?

Question

laptops

I decided to add a chip of RAM to the laptop. After I started it, the laptop worked fine, the new memory was also displayed. I worked for a couple of hours without turning it off and left it for the night already turning it off. In the morning, the laptop somehow stopped responding to attempts to turn it on, the entire device did not start.
Notebook model: Lenovo B590
New OP board: HP 16D3LS1KEGR/4G
Old OP board (Original): SM321NQ08IAF