The "buzz" that you hear is the fuel pump pressurising the fuel system up,this is supposed to happen.it should stop after a few seconds.It may have an immobiliser fitted,are there any locks/pads on the body work that suggest this ??.You need to find out if it is sparking,remove a plug from the engine and leave it dangling on the ht lead,but earthed to the engine.Turn the engine over and see if it sparks.If it does then you know that part of the system is ok.This at least will give you a starting point to work from.Good luck!