QSC RMX-1450 popping

I recently received a QSC RMX-1450 that had some issues where audio wouldn't come through sometimes and other times it was cracking and other times it was clear.  After doing some troubleshooting, I found it was the volume pots.  I ordered and replaced both pots.  After replacing the pots, it appears to be working with clarity, though the speakers I was testing it with were very low RMS so I didn't crank it up much as to not blow the speakers.

Now that I have it installed in my system powering 2 Martin Logan ESL-X's, I'm finding that the speakers when no signal is being sent to them are popping at a low volume.  The popping sound isn't loud and appears to be coming from the subwoofer for the most part.  It sounds much like an IDE hard drive reading/writing data.

I broke out my analog SPL meter and the lowest it goes is 60db at 0 and I register the volume just barely at -10db, so it's registering around approx 50db.  After doing further research, I found that on the same circuit, behind a UPS, I have a NAS and it is in fact detecting that sound and simulating it.

The other issue I found with the amp is that I have to flip the power switch 5+ times on and off before it finally clicks on.  My best guess is that this is a power supply issue on the amp (which should be an affordable piece for me to replace perhaps?) but don't remember seeing a dedicated power supply box in the unit when I resoldered the volume control pots, so it may not be such an easy fix.  I know some of you in hear repair units for a living.  Is this something that you've seen before?  Would replacing the power supply components be easy and inexpensive to do, and do you believe, considering the fact that half the time I can't even get the unit to power on (maybe it's a bad capacitor), that fixing this will also resolve it's sensitivity to the electrical feedback from the HDD's from the NAS, especially surprising since the NAS is behind a UPS which should be filtering power.  Perhaps it only filters the power one way and not the feedback the other direction?