car was parked up a while and when tried to start it it wouldnt turn not even with jump leads so replaced battery but still no joy and also stuck in parking mode?
Make sure the engine is not siezed. Or hydro locked? Any flooding? Try putting a 27mm socket on the crankshaft and turn the engine clockwise.
If it turns fine, I would try two batteries.
If that doesn't work, then it could be a bad starter or a brake light switch.