simple answer (not being funny) put the old one back in. if its the fuseboard inside the car, then the computer within the fuseboard memorises the information for the immobiliser etc. if it's the fuseboard under the bonnet, the starter relays are in that board, maybe could be faulty? you don't say if the car turns over but does not fire, if engine doesn't do anything, immobiliser light armed or not etc etc. information is the key here...
slipdiff
March 2010