enclosure or not you need to trouble shoot this.
If you not worried about warranty, then remove drive from the enclosure and connect it to a power supply.
If the drive spins then your enclosure is dead.enclosure itself performs the encryption by the way, so do not throw it out even if its dead.
If your drive does not spin up then PCB is most likely dead. Heads hardly ever get stuck on WD 3.5" drives.
do not initialize anything, or reformat anything
let me know what you find out about the drive’s state, and I will let you know what to do next.
