+1. Power supplies CAN fry pedals. Its a myth that using power supplies made by different brands will fry pedals (say a generic supply with a Boss pedal, etc.)
BUT, using a supply that uses a noticeably lower rating (possibly higher as well, of that I'm not sure) will strain and fry the innards.
There's also the dummy check, of making sure its not on Looper. I have done this with mine...

