Santepeter85:
... I'm trying to connect a 8 channel relais module (active low) to my arduino but i can't get it to work. I think i tried litterly everything but i want to check with you guys. Am i missing something, or is my (new) part just broken)...
The easiest way to test these boards is to not use any Arduino at all.
Get a 5v power supply, and first check that it is putting out 5 volts.
Then connect it properly to VCC and ground of the relay board, and (with the power jumper on) then take another (+) wire and try touching all the relay input pins one at a time. This should flip the relays on/off. If it doesn't, then something is wrong with the board.