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I had the same problem on a Mk 1 Laguna, I don't remember from where I had the information but I found out it was most important to try to keep the removed dash in the same position that it fits with the car avoid turning it upside down etc, I dunno but I guess it must be something to do with the LCD display unit.
Worthy of note, avoid buying the replacement bulbs from Renault at the time (about 6 - 8 years ago from Renault the bulbs cost £2 each from a local motor factor I bought about 20 costing £0:10 each.
Finally although it may already have been mentioned, make sure that you have the Radio code if you intend removing the battery
Currently in hondo's garage:
1.6 Valve-Matic SR. Red hot, toasty feet.