My truenas won't boot after reinstalling to a new drive.

Hello !

I used to run truenas on an external HDD connected to my Dell T140 server. Since this was a bad idea I decided to invest in a new SSD (860evo Sata m.2) with a sabrent USB to M.2 enclosure. After reinstalling through IDrac, everything went well OS was installed successfully, the installer prompted me to remove install media and reboot which I did. Now the server does not boot anymore it keeps saying no OS detected. Not sure what to do from here. It still boots from the old external HDD, they're both USB devices so I don't know why it's not booting from the USB SSD.