Dave rave

can you help , so I can help with problem can Anyone tell me 2 things , first is if my fob is not working (or no battery in it) and I put key in ignition Will any dash lights come on ( I know it will not start up lol) and second thing is if I took ecu off car , and put key in ignition (not working but the right key ) would that stop lights coming on dash ,,

Hi I was wondering if you guys can help shed some light.. I have an Audi Q7 abt 2006, basically it has been stood for a few months and the battery went flat so I replaced it because the old battery had gone but before I changed the battery it won’t start and can only get in the drivers door by key all the other doors are locked and can’t get them to open also the key won’t turn in the ignition even tho this key is coded for the car I had someone out to look at it and he said the only thing the car won’t do is speak to the ecu via the obd port do I need mobile vag com I’m not sure but the car was fine prior to being parked the only thing is the glove box won’t release can’t get to fuses on passenger door all other fuses seem fine key sticks in ignition and no lights and alarm is going and doors are dead locked no dash lights