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Would that be even possible (traces burning out) if my motors are working (kinda)?
Well, I'm going to try it (I will also have my chance to do the cable management, since from the bottom it looks really bad :D ), will edit soon. And yeah, I'll also check if all the RAMPS's pins are connected to MEGA's pins.

Edit1: All pins of MEGA are shorted with pins of RAMPS as they should be. No problem here.
Also I found out why there was only 0.01V on the E's DRV while on every other there was 0.018V - I had all 6 jumpers under the DRV connected so the microstepping was 1/32 I guess.
Btw, choosing full step (no shorting under the DRV) is what I should have done, ain't it?

Edit2: I put one probe of the multimeter (multimeter is set to short detection) on the PSU's GND and when I put the other one on GNDs of DRV's or USB's shell, the short was detected and the multimeter started beeping, so I assume everything's all right here.
I'm now thinking of everything that could make this stuff happen, so, it's okay to use the same pins of PSU for both terminals on the RAMPS? Like, I just coupled the same 2 cables (+ and -) of the PSU so I have all the power pins on the RAMPS connected. I'm just wondering if they don't have to be "galvanically separated" (not sure what's it called, but I think you'll understand).
I'm now afraid that motors are not connected well. And 1A might be connected to 1A but 2A might be connected to 1B for example. Something tells me that swapping two (neighbour) cables will only change the motor's direction, but I think it's worth taking a look at, or trying it..

Edit3: Swapping the motor's pins didn't change a thing. The shaft still turns randomly.
I'm wondering, isn't there one pin of the DRV that tells it the direction for turning the motors? The DIR Pin? Maybe I can measure it.
Using two PSU's didn't help either. The first 7 turns were in the same direction but it again went to rolling a dice...