Display, Mouse & Keyboard not working after upgrading RAM

Hey,
Today i got new Corsair Vengeance RGB PRO (DDR4 2x8GB) to upgrade from my last RAM (2x4GB). After installing the new RAM, my: keyboard, mouse and monitor will not start. I tried putting back the other RAM i used before and i still have the issue.
I’ve tried to remove the mobo battery and placing it back in after a while, but still no results.
Each component in my computer works (i believe) so i’m really stuck on this issue.
I’ve also tried multiple solutions online but none have been successful.

Specs:
Motherboard: Asus B450-Plus
CPU: Ryzen 5 2600
Graphics Card: Nvidia GTX 1070
Hard Drive: Seagate 1TB
RAM: Corsair 2x4GB (trying to upgrade to 2x8GB)