Renault Clio speedometer dials not working?

Renault Clio 1.2 16v billabong - We removed the speedometer cluster to replace a bulb but then finding they are non replaceable. Once put back in no dials work but the usual lights and computer works. We have tried the suggestion of holding down the trip button for 4 secs to put it through its test program and then turned on the engine and still no joy...arghhh help please