I'll give that a try, hope it works as I won't be taking it to any garages.U probably left ur car unused for a while and the frost got to ur battery, so whn u opened ur boot and shut it thn it wouldnt shut correctly due to battery. If u hav a spare key u will need it so whn u start up the car one key is in the ignition and the over key to play with the key hole on the boot. After u hav played about with it, shut the boot and it shud close smoothly making that noise. Hope this helped u?