PC won't boot to windows after unplugging old hard drive, after setting new SSD with windows as active drive in disk management, PC no longer recogniz

[Lucky5]

Awhile back I installed an SSD into my new machine and brought over the old hard drive to get data off, both have windows 10, now I've upgraded yet again with a new nvme SSD to replace the old hard drive that previously had been the main boot drive since it had games, but when I unplugged it, the PC wouldn't boot, plugging it back in fixes it, but it has nothing in user folder and all the user files were on the older SSD, I googled it and tried using this older fourm https://answers.microsoft.com/en-us/windows/forum/all/how-to-change-bootable-partition/907c92bc-67ff-469c-8cd9-73e86f647de0 , I went to disk management and set the older SSD as active and restarted, now even with the hard drive plugged in it doesn't recognize any boot drive
The pc was running windows 10, it was up to date
Asus B450, ryzen 5 3600 5600xt, 16gb ram