Few more pics -

Hi! That 'residue' on the outer case looks a lot like aluminium corrosion. You can scrape it off and finish with steel wool but I'd be concerned the corrosion continues on the inside. If that's the case that's very bad news because flakes might fall off on the inside.
Best way to test it without cables is to just connect power and see wether it spins up and performs the initial seek. Beyond that you'll need the cables.

Doornkaat wrote on 2022-11-02, 16:20:

....flakes might fall off on the inside.

I shaked the HDD and no moving sound coming from the inside....
Should I open the inner section?

ayandon wrote on 2022-11-02, 16:35:

Should I open the inner section?

Only if you can do it in a dust-free chamber.

Also, keep in mind that it's a stepper drive - and such drives in general don't park their heads automatically at power-off.
So, if you get it to work, first thing to do would be transfer some head parking software onto it - eg. SpeedStor 6.03 should be OK - and park the heads every time before powering off.

Grzyb wrote on 2022-11-02, 16:50:

Also, keep in mind that it's a stepper drive - and such drives in general don't park their heads automatically at power-off.
So, if you get it to work, first thing to do would be transfer some head parking software onto it - eg. SpeedStor 6.03 should be OK - and park the heads every time before powering off.

Yes, I do remember (when I was kid).... I need to run a 'park' command to shut-down the PC.