Range rover sport won't start 07 Hse TDIV6

hello i am new to this furum and its like my 07 RR Sport is all on-top of me My 07 range rover sport Hse TDIv6 just stopped on the way while driving then some messages started popping up on the instrument cluster that is, transmission fault limited gears available, Engine system fault, HDC fault system unavailable and system fault special program unavailable, key security light flashes, hazard light flashes, temp gauge moves to the top immediately when the ignition is switched On. we finally towed the car to a local garage and they discovered the a dumped alternator but after replacing the alternator, the car could not still start with the hazard light keep flashing, temp gauge moves to the top, key security light flashes check engine warning light just disappeared from the instrument cluster and we hv E on the gear position on the board etc. i have also replaced the battery with a brand new of same capacity, fitted a brand new ECU but no luck please have any one witness this and i will be really happy having ur opinions

I am afraid there aren't many sport owners on here as far as i know, i had a quick google and the following link may help you, it is relating to multiple faults and the instrument pack as a potential problem.
As with all of the later range rovers, diagnostics is usually your best place to start

Multiple fault codes, Hazard lights flashing and won't start

try RRSPORT.CO.UK • Index they are more sport based....hate to point you to another forum, but please do post back here if you find the result!