i had a similar situation right off the bat with mine, although mine would turn back on if i kicked it.
trouble is i have no idea what i did to fix it, i just opened the thing up (instantly voiding my warranty) and looked for cold solders or shorts (potentially fatal because the circuit retains high voltage after power is removed). i didnt find anything, but when i put it back together the problem was solved and i felt like a very lucky idiot.
my first suggestion is to tap on the top of the box and see if you can get any response, my second suggestion is to bring it to a shop that has other ehx tube pedals in stock and try out another power adaptor. my third suggestion is to contact ehx about warranty repairs. i do not suggest taking my course of action.
