I assume that you have good pressure? I assume that the cold water is pumping fine? I assume that you don't have a problem with your pressure accumlator tank? I assume that you don't have leak in your plumbing
Then, my guess is that you just need to allow the pump to do it's thing. I'd open the farthest valve/faucet in each branch of your system: first the cold, then the hot. You should just open the valves a bit. You want to allow the system to purge itself. After you have the farthest point, then I'l do the same with any intermiate locatons.
Do or did you get spurts or "burps" when you do this?
Is your pressure shut-off switch cycling?