I was out in my Elise (Series 2) the other evening and parked up the car. I switched off the engine and removed the key and noticed that the light behind the speedometer and rev counter was still on (as only normally happens when my main head lamps are switched on). I also noticed the immobilizer light was not flashing any more. Shortly afterwards I restarted the car and noticed that now the speedometer and the rev counter were not registering at all (both remained on 0).
After a short drive home carefully judging my speed ;-) I parked up the car. Just had the RAC round and they recharged the battery (that had gone flat due to the backlight remaining on) and now the car seems to be ok again.
Has anyone ever come across anything like this - since Im concerned there might be an underlying problem?