I was playing for about an hour, left for 15 minutes and then my Electro-Harmonix Metal Muff stopped working? Any ideas why?

I was playing with a CRATE G212 amp and had an RP50 (Digitech) hooked up also.
(Guitar>Metal Muff>RP50>AMP) They were all hooked up with a daisy chain power adapter.

It now just wont turn on! Please help!
try it with a battery and no plug in see if it works

07 Fender American Deluxe Strat
07 Fender Custom Telecaster
09 Seymour Duncan Pickup Booster
09 Fulltone OCD V.4
10 Ibanez WH-10 V.2
09 Splawn SuperStock
10 Jet City JCA-20
97 Fender Hot Rod Deluxe

Yeh the SICK! bit sounds a bit stupid.

used to have an MM good pedals, but batteries ud be lucky to get 20 mins
Music is the holy grail, sod wine water and the blood of jesus