There was a number of threads on this topic. Basically, nothing in your install should be able to ruin empeg's capability of recognizing its environment, as this is done in extremely simple way: home power connector on empeg has a switch that recognizes whether something is plugged there or not.

Somebody suggested that inserting AC adapter connector obliquely and off-center could hasten the demise of the switch. Somebody else (from empeg, I think) described how to use a tweezers to try and bring the switch back to its senses (on warranty-voided empeg, naturally), as well as how to replace the whole connector, which is a rather standard part.

But, since your empeg is still under warranty and you are (I gather) more or less next door to Cambridge, perhaps you should skip home remedies this time .

Cheers!

Dragi "Bonzi" Raos
Zagreb, Croatia
Q#5196, MkII#80000376, 18GB green