can a power regen. eliminate ground loop hum etc?

hi all. i have 2 dedicated ac lines, one audio, one video. i am, however experiencing a somewhat nasty hum/buzz when my cable coax is connected to the system. i have tried lifting the grounds and plugging the amp into different outlets. the noise just gets worse.i also have the rolling bars up the tv screen. i was under the impression dedicated lines would solve this anyway. so, i now think i am in need of a power regenerator. are they capable of fixing such issues. the hum/buzz is always present but much much softer when the cable tv is not connected. any suggestions for particular products or manufacturers would be appreciated. thanks, d.