Hey there wonderful, intelligent line 6 community! Ive had a line 6 HD500x for the past year and something very strange happened today. My POD was connected to my iMac and hooked up to a external monitor through the XLR output and i unplugged everything and took it to my friends to work on some tones. When i hooked the POD up at his place every patch had a hum like buzz to them. I did a factory reset, nothing. i checked my cables, nope. I even went straight to my fender deville amp and still had it. What could my issues be?