60Hz hum

Hello,

I have a 60Hz hum and I don't know what to do. I must admit that I am dumber than dumb and I know nothing about nothing so my knowledge is very limited here but I did read about It and tried a few things to, alas, no avail.

A bit of context: My system have been playing for a good 7-8 years without any problem but a few days ago I moved furnitures around and did a bit of cleaning and before disconnecting everything I heard a hum in my speakers that I never heard before. How long is/was the hum present I don't know but my room is fairly small and the system is always on yet not always playing because It is my living/audio/TV room all on one. I am pretty sure I would have heard It by now but I didn't so... Bottom line, not sure since when the hum is there.

Once I cleaned up everything and connect everything back on to exactly the same set up as before the hum is still there. What I did so far is connect/disconnect one component at the time and tried to isolate everything. 

In the end I'd say the hum is coming from the integrated. I disconnected from the power bar, I tried direct to outlet, I changed outlet, I changed outlet with and without the power bar, I even changed room and outlet with the integrated and speakers. I tried left speaker, I tried right speaker, I did tried 2 different speaker cables. Hum hum hum... So I don't think Its neither the speakers nor the speakers cable. My logic tells me that It has to be the integrated. 

Where do I go from here? Is my integrated broken? What do I do now?

Any help would be appreciated.

Thanks!

NAD C315BEE integrated
Totem Arro speakers
Blue Jeans Cable BJC Ten White speakers cable
Monster Cable power bar