Hi i dont think the radio is the problem,I would be looking for a common denominator. If these isues are connected I would be looking at major power/earth connections starting at the battery.I believe the indicator tick sound comes through the speaker so if radio stops functioning no sound will come from the indicator.Check all earth terminals at battery and where it connects to chassis.Also check the positve terminal Lift the red plastic terminal cover and check all cable terminals are tight (use a small amount of force)some techs seem to miss this area because of the plastic cover. If all appears ok take it to Holden preferably when the no start issue is apparant. Good luck