Could My Friend’s Old Power Supply Be Frying His Graphics Cards?

I recently helped my friend upgrade his PC by giving him some of my spare parts. He went from an i5 4460, GTX 970, and 16GB of RAM to a Ryzen 5 5500 and RTX 2060 with a new A520M motherboard and more RAM (2x8GB). The only part that stayed the same is his old 600W power supply from 2015.

He often experienced freezes and black screens while gaming on his old setup, but he could still communicate with us on Teamspeak. After the upgrade, the same issues cropped up even more frequently, sometimes right in the game menus. The event viewer shows a Kernel Power 41 63 error.

I've tested the RTX 2060 on my own setup to see if it's a GPU issue, and I'm still seeing the same error. So far, I've ruled out the CPU, motherboard, and RAM as possible culprits, as well as driver issues. Now, I'm starting to wonder if his aging PSU could have fried both his old and the new GPU I provided.

He wants to buy a new GPU, but I'm concerned that his PSU might damage it too. I'd really appreciate any insights or opinions on this!