2004 Discovery G4 will not start. When key is turned to position 1, dash lights come on, then when turned to start, nothing happens and all dash lights go off. Subsequent start attempts yield absolutely nothing...no dash lights, no solenoid clicking, nothing! Found that disconnecting then reconnecting the battery resulted in a normal start, i.e. not a bad battery. Suspected a possible problem with the security system, and have left the vehicle unlocked, and it starts up every time. Is there a possible problem with the security system that is locking out the ignition? Just ran out of extended warranty, so would appreciate any advice before going to the dealer!