"his cord does not originally belong to the Arduino. It's actually a cord from my laptop cooler."
That cord may only have power/Gnd connected, and not the 2 data lines. Check it with a multimeter.
"his cord does not originally belong to the Arduino. It's actually a cord from my laptop cooler."
That cord may only have power/Gnd connected, and not the 2 data lines. Check it with a multimeter.