Probleme with the akai rpm3 monitors and ur28m

there’s a constant shhhh from the monitors. Now the output level of the ur28m is low and the volume of the speakers is set kinda hi so when I open cubase 6 and I up the output level there is a mager bug sound, its probably an interferance. idk if its normal or not ? Recently no insert effect working anymore. Just for advise my studio is only hardware like numeric syth, analogue osc, synthetic drum machine some tenori-on and re-20 space echo. For now im using win vista 32 bit - 4 go ram. Probably update soon (more ram and going for 64 bit). I really dont know what to do :unamused: :cry: