So I installed Pop OS a few days ago, alongside a fresh install of Windows. I installed rEFInd boot manager as well, to manage both OS options.

Anyway, I configured it all and everything seemed/seems fine. It would always boot to rEFInd via bios configuration and I was able to switch between the two. That was yesterday.

Today however, I've realized that it will only boot into Windows. I looked into the bios and everything is set correctly. However if I force boot into either Pop OS or rEFInd, then the screen goes black and just returns me to the bios.

How should I go about debugging this? I genuinely have no idea what might have happened. I was last on Windows. When I look at the Pop OS partitions in Windows, they're all still there and seemingly fine.