noise!

i`m having trouble with the rca conectors, i have a samson servo 260 + 2 samson 12`+1`conected to the hercules rmx. the ampli have both plug and rca in conectors, in the plug section one of the conectors doesn´t work (the one that works works fine), so i move to rca... and i found that tipical frying noise... i`m working on the ground conection but... who knows... maybe its some config issue...

any help? txs in adv!
doc

So you are going from RCA to RCA, correct ?

I'm guessing you double-checked the cables ?

Are you runing of a laptop or decktop computer ?

If a laptop, are you running on battery or powered ?