Steady loud hum on all mpc outputs... ground issue??
I have an mpc 1000 & presonus firestudio interface. Been using both together, each plugged into different outlet, for months with no problems, no noise. I got really busy and didnt use my mpc for a month or so, it sat unplugged. (possible important note: at one point it was knocked off a table and took a pretty good fall)
So I'm ready to work, I plug it in and set it up just as before and now I'm getting a very loud constant hum out of all the outputs. Hum is present whether turned on or off, as long as its plugged in. I've tried different power cords, different cables (balanced, unbalanced), I've tried multiple outlets, plugged the power strips into each other, every combination i can think of. I tried running the mpc thru a roland 404, still get buzz. Nothing kills the hum, unless I unplug the mpc. & It's a rather loud hum.
Is this a ground issue? If so why did it just start, the setup was the same as before when there was no hum. Did the power supply go bad? Did something break or come loose when it fell that could be causing the hum?
Also, I don't think I can hear any hum when listening with headphones. Also, I was able to record beats from mpc into roland 404. Then i uplugged mpc and played the mpc recording from the 404 to firestudio w/ no hum.
Hope this isnt too confusing... but im confused.... any help????