Troubleshooting hum

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Hi

I'm a noob to fixing electronics so please be gentle with me:cannotbe:

I have a H/K AVR310 which I bought off someone for pretty cheap. The problem is that it hums on all speaker channels at all volume levels. I tried every outlet in the house, but it is the same. Everything else works fine. I opened it up today to see if I could find anything out of the ordinary, but i don't really know what to look for - just wiggled around wires.

Thanks for the help
 
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