Onkyo 674e with KEF2010 sub problem

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Onkyo 674e with KEF2010 sub problem. Hi all, I have an onkyo ts-xr 674e amp/reciver and a set of 5.1 KEF speakers in use for the last 4 years or so. My sub (2010) stopped working a short time ago. My question is how can I check if the problem is my amp or my sub? The sub powers on ok but it has no sound. It won't power on when left in auto mode in which it should automatically power on when sound is fed to it. So I switched it to manual. Ive tried playing around with the amps settings but no joy. One thing I did notice was when I plug out and in the subs sound cable it does emit a loud thump. Any advice would greatly be appreciated.

 

[Anonymous]

Fixed!
I reset the onkyo amp/receiver back to factory settings and my sub is working again.