got my power fc today put it on car turned ignition on and this clicking started, i looked in the boot and it is a blue relay next to fuses ?
car would not start put standard ecu back on and no noise and car started ?
Try to push the ecu connector in on the side's if you understand.
I think i had the same problem on my car, the ecu connector was "bendt" when someone overthightend the bolt that holds it in.
Solved it with a pair of cable ties around the box and connector.
Hard to explain for me since i'm so bad at english but i hope you understand.