Computer problem
2004 Renault Megane 4 cyl Two Wheel Drive Manual 40000 miles

hi
my battery went flat on my megane sport 225 2.0l
i managed to start it via jump leads from another fully charged battery, but since then the esr light has been stuck on and the computer no longer functions when you press the right hand stalk, any idea what this could be?
kind regards
alex