Actually is seem as if the problem lied within the installation, after changing my amp (which was pretty crappy) to a better one the empeg boots up just fine.
The new amp has listed 'pop-noise-cancelation' listed in a features list.
i dont know wheter it is actually the higher quality amp (higher power so the input gain be set lower too, which are now proberly adjusted thanks 2 tony) or if its that anti-pop feature that solved my problem.
In either way, i'm pretty happy now.
Oh yeah, ... Thank you Tony.
Your patience is admirable.