@Joezilla,
Helpful video, thanks. From your comment on the video, I think you have a good idea that an incorrect mains adapter
was attached, and that's not just a wild guess that you're making. Correct?

I understand the replies from other members although I'm interpreting at least one of your comments differently to some other members, I think. Remember that DIY recovery attempts
definitely have risks (especially in your situation, for several reasons). You could make things
much worse for any of several possible reasons like lack of experience, incorrect procedure, ESD damage or just bad luck etc.
However, although I couldn't hear the faint clicking that you mentioned in the video, I didn't hear the drive spinning-up at all. Is my understanding correct? If so, then the clicking is not coming from the drive either, which is potentially better news for you, than if the drive itself was clicking.
[Edit: While I've been typing this, your reply to previous comments has just confirmed that the drive isn't spinning-up, so my understanding is correct.]
If the drive isn't spinning-up then I can guess (but it is only guess, without further diagnosis / measurements) what is making the clicking that you mention. Personally I suspect it's related to the DC-DC converter repeatedly restarting (these can make a faint sound for reasons too long-winded to explain now), but that's likely to be a symptom of the real problem, not the true cause - I definitely wouldn't start by replacing the PCB in the enclosure, without further diagnosis.
Your next steps depend on the value of the data, and the risks that you are prepared to take with it. You have already received good suggestions for two USA-based professionals (another professional USA member is quasimodo) and you should seriously consider one, if you want to avoid causing further (preventable) problems by your own actions.