I have recently also had this problem. My dash flickered for about a week, then went completely blank. I contacted my local renault service centre and have now had it replaced for £100. Renault know there is a problem with any 2004-2005 instrument panels and so foot the rest of the bill to replace. It came back with 0 miles on the clock, but they also sent a letter confirming the last recorded mileage from my last MOT, and that it has been reset due to a genuine error. This should suffice for any further potential buyers when I sell it on in years to come. Very satisfied with the Renault service.
Macca, January 2011