Eletronic problems with 4.0 V8 01 jag s type

Seller stated that 01 jag s type was running fine then They installed a new battery and now the car doesn't crank over no response from windows dash lights won't work correctly. Sent it into a shop and said it gets power into the ecm but not out. It came into My care thought the issue was the inertia switch reset it bought a new battery for it I go to put the terminals on and the lights (all external lights headlights/taillights etc) stay on the engine fans start spinning I put the key in and the dash lights will show in the position before you attempt to turn it over but as soon as you turn it over the car horn sounds and the red security light flashes right next to the front windshield but windows still no response and will not crankover don't know if this is problems with the ECM please let me know!! Update: all fuses including the mega fuse does not look to be blown, when the new battery is connected the cars headlights/tail light and turn signals stay on and fan in the engine starts running constantly I have nothing on the radio or basically any interior eletronics working no window roll up/down at all no dash lights then I stick the key into the ignition and turn it to the 1st position all the dash lights and radio lights turn on but still cannot roll windows down and no sound from radio then when I go to try and start the car nothing happens except the car horn starts sounding constantly but cannot start no crank the dash lights and every thing goes off untill I put it back into 1st position would this be bad ignition coils and may need key reprogrammed? Or would this definitely be a bad ecm/ecu even if no fuses seem to be blown. NEW UPDATE Update I found how to get the security flash off and all the eletronics work EXCEPT every switch for the widows/sunroof do not work and will not crank or attempt to start lights and engine fan constantly stay on while hooked to battery