I NEED HELP WITH A NOISE PROBLEM

MY MPC2000XL, MAKES A LOT OF STATIC/HUMMING NOISE WHEN PLUGGED IN FROM THE OUTPUTS BOTH LEFT AND RIGHT.(THIS DOES NOT OCCUR FROM THE HEADPHONE OUTPUT)..THE NOISE CONTINUES EVEN WHEN THE VOLUME IS TURNED ALL THE WAY DOWN...I BELIEVE THE ACTUAL OUTPUTS NEED TO BE REPLACED..SO IF ANYONE HAS ANY HELPFUL INFO ON WHAT THE PROBLEM COULD BE OR WHERE TO GO ABOUT GETTING THE NEW PARTS I NEED CAN U PLEASE LET ME KNOW..ASAP...thanx alot for the help....javi

i got beats up at myspace.com/boyinsleep

ALL CAPS IS NOT NEEDED
Where is the cord going out from the L and R mono outs going?
A mixer? If so, ground the mixer.
Soundcard? If so, ground the soundcard.

sorry about the caps yo...im going from the left and right outputs to pro tools on G5 mac...its definately the mpc's outputs cause the headphone jack sounds clear..ive checked all the pro tools inputs with other instruments,...when the volume is down the buzz is still there...so i dont know the only thing it could be in the outputs or something else in the mpc...anywayz have you ever heard of an mpc's outputs going bad?..it has been through alot like touring and weather changes...so let me know what i can do...i need to get parts i think, if i can get a hold of them i got people to do the work for me.i dont know but i need to get this shit fixed.thanx for the help..hope to hear from you...myspace.com/boyinsleep

Try this:
Turn off your MPC
Is the hum still there?
Unplug your MPC
Is the hum still there?