You will need to check that all the brown wires are earths in the CPU.
For this you will need an electrical multimeter set to ohms (lowest range) or continuity.
Connect the plug to the cpu and measure continuity from brown to brown, the meter passes a low current through the circuit and this will not damage the cpu if connected to the wrong wires.
Hopefully all browns join at the CPU if so connect any to any.
There might be a few sizes of wire connect big to big, small to small..
Good luck