CDJ 2000 Nexus wont start up

Hi there,

I recently changed the circuit board with the Ethernet input on my CDJ as the old one had died. Since doing so, my CDJ wont start up. Iv checked all the attachments are reconnected and everything was as is was before.

The circuit board was bought from an authorised Pioneer dealership so I doubt its the board itself. 

Anyone got any ideas?

Thanks Sam.