Need help. Reboot and Select proper boot device or insert boot media in selected boot device

Ugh so I took out my video card power cord to help my son with his computer. Put cord back and I am getting reboot and select proper boot device or insert boot media in selected boot device and press a key.

Running OpenCore - Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina

Thanks in advance for any help.