Ahhh help needed

[kennerley12]

My 172 was running perfectly fine, i took the battery off because i needed it for something. ive put it back on and now my car just turns over and wont fire?? any help would be appreciated thanks

 

[biojo]

is imobiliser light still flashing? tried spare key?

 

[Fred@BTM]

lock/unlock on the blip a few times first