Rover 200 400 25 and 45 if non start no cranking, check the large spade terminal (Push on) on starter motor solenoid (air filter) pull terminal off and clean with WD40 and refit.
Remote control key fob not working, make sure battery on car is not flat (bright headlights) if ok check fob battery, should be 3v if ok, press buttons with battery removed (to discharge stored electricity ) refit battery unlock car with key and press lock button 4 times, it should lock by the forth press.
If the remote still won't work and you have the 4 digit security code, you can input it with the driver’s door lock like opening a safe, with the car locked, if code is 4567 you first turn the key to the unlock position 4 times, then 5 times to the lock position, then 6 times to the unlock, then 7 times to the lock position, then unlock car and start car straight away. If the code has worked the immobilizer LED will not be flashing and central locking will work. You will have to enter code every time you start car until remote is fixed.
Many Rovers can lose all electrical power, they have an earth connection point on the bonnet catch panel next to battery, and these can suffer bad connection or break due to the battery moving in its tray due to the clamp being left off.
Rover 75 petrol pumps can give many problems, they can fall to pieces in the tank (a retaining clip is available to stop this happening) sometimes the gauge will read wrong (try jacking up O/S/R)
75 diesel lift pumps also give problems; these are under bonnet on bulk head and will often work again if tapped.
Head gaskets are a problem on all 4 cylinder Rovers, click the link for symptoms Head Gasket
Use the advice links above to help diagnose your non-start, immobilizer, warning lights, and engine or general problems. No problems listed by make and model on these.