Pic16F883 Power on loop back problem

Hi
I am trying to use a push button (held down) to complete a circuit and turn on a Pic16F883
Let me explain.
The Pic is turned on by pressing a push button to supply 5v to a 2N3904 Transistor Base via a 1K Resistor.
Which acts as a switch turning on the Pic (pic +ve to 5v and Pic -ve to 2N3904 Collector
Emitter to -ve
After boot up routine Output A3 is activated to turn on 5v to 2N3904 transistor Base
Basically I am trying to use A3 to keep the transistor or opto turned on via the 2N3904...

Pic16F883 Power on loop back problem