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Yes, Ramps is along with mega.

When I have the USB cable disconnected (when the motors are not active):
Well, I cannot measure any voltage between the trimpot and gnd of the driver - it shows no sign of voltage.
However, I can measure the voltage between the trimpot and "-" of the PSU (and so I did, all the numbers I wrote before are measured by that) - it says 0.04V and it doesn't change even if I move the trimpot to it's ends (mine stops when you reach the max/min). Also the motors are equally strong and it doesn't how I turn the trimpot - only at a tiny point - when I rotate it to it's minimum, the motor stops working until I set higher voltage again.

Now I tried brand new driver (for times like these I like to order one more piece of everything). I screwed the trimpot to the minimum voltage and turned on the PSU while USB is not connected. Between the GND and trimpot there was 0V, but between PSU and trimpot there was 0.018V. This finally seemed right to me.. Until I realised that when I turn the trimpot, the voltage stays the same. Still 0.018V. (Turning the PSU off, moving the trimpot, turning PSU on and measuring it - doesn't change a thing. Still same measurements).

It's only when the motor is running that I can adjust it I guess?

BTW: My minimum of the trimpot seems kinda opposite of where it should be. When I screw - I get to the minimum; When I unscrew - I get to the maximum.

But it doesn't seem probable to me that the drivers are gone, since the motors move nice and smoothly (if I have the right settings for them).

You don't need to see any pictures or the video if you can imagine the problem I have, I'm including them just in case you wanted to see it :D.
Here I got some pictures of measuring for you (they are just showing what I wrote here):
And one video of the Y-motor moving - though with every axis, the same thing happens (with ultra low acceleration...):

PS: Should there be any of the pins under the driver shorted or not?

Sincerely thank you even though we haven't solved much yet. I didn't expect responses kind like that :)