No start on 97 A4 2.8

[EGOR46 at aol.com]

I hope someone can give me some advice regarding my son's A4.  His car was 
involved in a left front collision and now when the key is turned to the 
"start" position, there is nothing.  A faint click but the starter doesn't 
turn.  In addition, when the key is turned only to the run position the fuel 
pump relay buzzes like it is rapidly being energized and de-energized.  The 
fuel pump also rapidly switches off and on in unison with the relay (makes 
sense}.   I pulled the relay and it tested good.  I then jumped the socket 
terminals and the fuel pump ran steadily as it should.  The collision did no 
damage to the wiring harness in the engine compartment.  Any ideas?