Technical has anyone fit Pioneer DEH-S420BT ? could use some help as the unit does not power on

[jake098921]

I have recently purchased the above pioneer radio, i cant seem to get it working, the original radio still works when plugged back in, do i need to swap the connection of any of the wires on the adaptor loom

 

[jake098921]

I have bought a similar unit for my 2010 Clio mk3 so assumed it would be similar plug and play