memphis 16-pr1kd

[chev55_steve]

hey i dunno if im the right forum or not but w/e i have a memphis amp wen i got it it was fine but it need new rca inputs so i put them in and the amp worked great but now it doesnt work the green light is on but no sound but if i pull the top rca wire out like hald way the sub will make a constant bass line slowly getting louder untill it kinda pops and goes in2 a higher pitch then when it does that i plug the rca wire back in and the sub works fine and sometimes if i leave it alone and just drive the amp will come alive on its own im so lost with this i can fix obvious problems when i can see them but nothing is out of place or burnt any help would be greatly apreciated

thanks steve