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I recently purchased brand new Ibanez RG652AHMFX Prestige series guitar. Beautifully looking guitar.
Unfortunately, it hums in any position of the pickup switch even on a clean channel. That hum becomes awful with higher gain.
Touching strings does not do anything, but when I touch one of the metal knobs (there are two) it goes away. I tried three different amp, changed cords, tried it in a different house, used special power supply, but nothing helped so far.
I took it to Guitar Center to check grounding, they did not find anything wrong. Moreover, I tried this guitar in Guitar Center and there were no any hum.
This guitar has DiMarzio Air Norton and DeMarzio The Tone Zone pickups.

Any ideas what can that be and how to fix it?

Thank you.

Leo
 

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If you touch the knobs and it stops then it sounds like a grounding issue. You probably have a cold solder on the ground circuit. I wonder how guitar center checked it? If you bought it from them... And it's brand new you are entitled to it being fixed for free or get a replacement guitar. I can't believe they would let you go home with it buzzing.

Or it could be a defective input jack. I had to replace my enclosed cylinder... Or barrel style jack in my new JS guitar about 5 months into owning it. Even brand new they are finicky with certain cables. For example... My 3 Ibanez guitars all have barrel jacks. They hate my fender cables and Ibanez cables they always buz. Where my mogami and monster cables work great. I think it has something to do with the length of the input shaft on the cable.

After looking at pictures of your guitar, I can see it does indeed have a barrel style jack. But it sounds to me like a cold solder in the ground circuit because the hum goes away when you touch the metal knobs. And the fix for that is to reheat the cold solder and reliquify it to create a solid connection.
 

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see if the hum goes away when you touch the bridge. I suspect that it won't, and that means the ground wire has a cold joint, either at the volume pot end, the trem claw end, or both. Just touch them up with a soldering iron to let the solder joints flow together and you should be good.
 
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