Electronics 2000

Hi to everyone. This is my first post here. I have a problem that has confounded Meridian tech support so I am hoping someone here might be able to solve it.
I have a Meridian m80 all in one audio system. It works perfectly apart from when I plug in my sagem pvr. As soon as I do the front buttons ( eject, equaliser etc) stop working. The remote still works ok and all other equipment such as the tv and DVD work fine. If I unplug the pvr the Meridian works perfectly again. The pvr itself works perfectly. Does anyone have any idea what the problem might be. Thanks Jo.

I should just add that I mean when I simply plug it into the mains. The Meridian is not connected by any other cables to any other equipment. The problem occurs when both are plugged into the mains.

You want your money back... citizens advice ...