2002 Mini Cooper Cannot switch on the car

the car is not switching on

Are you trying to say it cranks over and will not start or just won't crank over at all/nothing be specific so we can answer you accordingly-

Sirs,

My Cooper since one month the gearbox was broken, I changed the whole gearbox and still at the garage since we put the replaced gear box the car is notbswitching on eventhe battery is full. I had no other problem only the gearbox.
Is that because we removed the battery cable for this period or it's an alarm issue and needs to be reset.
My mechanical is trying many scenarios with no success.

Can anybody help pls do we need to reset the computer of e car

Thanks