Try another SATA port.
Check the BIOS boot order to set SSD first, HDD second. If you need to boot a disk or stick use the BIOS Boot menu key at boot.
Did the HD have an OS at one point? It may have boot code remaining that needs to be wiped with Diskpart Clean Command
after moving the data off.
Let us see a maximized Disk Mgmt screenshot showing drive map and listings with all drives attached. Use Snipping Tool in Start Menu, attach file using Paper Clip in Reply Box. Tell us what's on each drive.