My electronics have a fault which won't allow the car to start?

Sounds like you need a new battery and/or possibly a new alternator.
Try a new battery or borrow one, if it starts then it's the battery, if it starts then won't the next time you start it say few days later, then it's the alternator as it won't be charging your battery.
The dash could just be bulbs have blown.

Performance renaults .co.uk
June 2007