External Drive not showing up, light blinking, iMac External Drive disconnected during backup but now it won't show up again. The light keeps blinking. How do I fix this problem?
What I tried and didn't work:

New USB cable
Connect it to a different Mac

The drive shows up on Terminal with
diskutil list
as
 /dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk2
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk2s1
   2:                  Apple_HFS ⁨Diskname⁩                    2.0 TB     disk2s2


It can't be unmounted with diskutil unmount disk
No FSCK is running in Activity Monitor
What's going on?
Next to the apple icon in the left upper corner ( In Finder) click Finder , drop down menu choose preferences and see if its checked in sidebar.