u/Adept-Idea-6177

I have this system that I was cleaning out, Asus ROG B450-f. It was working this morning. It had been a while so I repasted the CPU, Ryzen 5 2600. And dusted everything out. I reassembled, and now it's just dead. I am getting a led indicator on the board. And when I first plug the system in, I get a flash of the led strip, but that dies in about half a second. I've reseated everything 8 pin 24 pin CPU cooler. Would I be getting an LED if it was the PSU? I'm stumped. Everything is off the board, every dropped to one stick of RAM. Checked the standoffs for shorts...I have no idea