engine noise....help!!!!!!

i have a pioneer indash flip out screen, a kenwood equalizer, a punch 500a2 and a pioneer 350x2 for the highs. couple days ago i installed a dvdplayer and a visor screen. as soon as i got thru connecting it i turned on my car and i heard some loud ass engine noise when i would turn the eq off it would sound less and i also could hear it thru the subs. but before i connected the dvd and screen everything was fine... then i had the rcas and power cables running thru the same side so i ran the rcas cables thru the other side. and i switched some cheap rcas that i had to the highs wit some twisted tsunamis. thats didnt work.. then i bought a ground loop isolator. that didnt work.! oh and everytime i am unscrewing the dash i could hear the sub making noises as if i were making it move while i unscrew... anything will help...