Windows 10: Two installs of Win10 on different drives, won't boot one of two insta

Hello,
I am not sure this question belongs here, couldn't find an appropriate classification

I had a working Win10 os. Then I bought an SSD and installed another Win10 os and set up the pc to multi-boot. The original OS did boot once or twice until I learned about ahci for the SSD. I think this is when it was no longer possible to boot from the original OS.

So, when I try to boot the original OS (after having set the BIOS to ahci) the machine constantly reboot. The second OS however boots fine.

I have two questions regarding this.

1. Is this happening because the Original OS was not set up for ahci?

2. If so, will changing the registry entries having to do with ahci ( on the original OS) fix this?
(I intend to physically reconnect only the original drive to do this.)

Thank You in advance.

:)

 

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