That's the way to diagnose it
I totally agree with you Jamesedward123, that is indeed the way to test his rig/system, but that's also why I want to make sure he starts out with a working set of speakers.
Those can't be to hard to find, the most simpliest set will do, and at least it makes diagnosing and testing a whole lot easier having ruled that out.
It's 3/10 shot that the speakers are gone, but it's the first thing you've got to check-off on the checklist.
That's my opinion though.
Imagine he makes changes 'cause he keeps hearing the "buzz" and after several changes he finds out it where the speakers after all.
After changing settings a few times, there's a big chance you forgot what the initial settings where.
At that moment, he's got to find himself new speakers and do his entire set-up from scratch.
I'm just trying to be logical in testing/ruling out possibilities.
That's all.
And by the way, as far as I'm concerned, your help is very much appreciated.
First it's always nice working with others and second, two know always more then one