You still haven't really told us enough. Is the car completely dead? Do any of the accessories work? Lights? Do the hazard lights flash when you try to start the car? When you press the brake do the brake lights come one?
If the hazard lights flash when you try to start the car and it wont start, the car thinks it's been in a crash. Just turning the key should cancel this, if it doesn't it means the battery charge is too low (either the battery is bad or the connections are bad).
If you do not see brake lights then your brake light switch could be bad. This causes all kinds of problems on the LR3, but unlikely this went bad at the same time you disconnected battery. I would concentrate on the:
battery
battery terminals
battery terminal wire connections
ground from battery to chassis
Since those are the only thing you have touched.
Do you have access to a battery charger? Any way for someone to try to boost you?
