79robb :
Basically in the title. When I try to boot the SSD directly it says reboot and select proper boot device.
What happened was you had both drives connected when you installed on the SSD.
So...Windows has a nasty habit of putting the boot partition on the 'other' drive. It doesn't need a full install of Windows, but without that second drive connected, no boot for you.
Is this a brand new install?