intermittent static out of one channel?

i've swapped around all the cables and stuff and currently i just have my speakers connected to a peachtree nova, i thought it was the nova at first so i sent it in for repair and they said theres nothing wrong with it

then i get it back, and there's the same intermittent static noise out of the right channel

i disconnected all inputs and just left the speakers connected and it still happened, peachtree said the nova is fine.. ive tried different speaker cables... any ideas?

the noise just comes and goes, very random, the static sounds like wind blowing