Sound like fuel pump, as was said before turn off anything in the car that makes noise (radio, climate controls etc)and see if you can hear the fuel pump come on, if it doesn't than you know the problem.
Another thing you could try..... get a rubber mallet and lightly tap ( not too light... but not too hard either) the fuel tank where the fuel pump is.(it sometimes gets them going)
and if all else fails, take it to the mechanic
Raz