Dual Boot Issues - Blinking Cursor

Now it’s a different problem. When I try to boot from my secondary hard drive it boots from Windows when it’s not installed on the drive. I have it partitioned, and even unplugging my main ssd doesn’t stop it from booting windows

This Q&A? You need to ensure GRUB is installed on the second harddrive in the boot sector.

I have one partition as NTFS and other as Ext4 if that has to do with anything. Will try installing again now that I have backed up my hard drive.

Tried again, installs but when I boot to it there’s just a blinking underscore