Not hearing the amp come on right away is normal...its just waiting to get the power signal from the remote power wire.Now as for the speakers not working at all,sounds like a loose wire for the second post,and for the 1st post I dunno,One of the amps in the trunk area are for the lower door speakers.I would check wires and the fuse box.Hopefuly that amp didnt take a dump.
The amps for the bass are in the trunk,there is one connector there on each amp,one that connects to the radio,and of course in the door...wires goin to each speaker.But if both speakers are not working Its most likely at the amp or head unit.