try to unplug the power cord from the back wait a few then plug back in (I'm assuming you have NO power what-so-ever). If it comes on after that could be a ground/fault problem so the answer would be either a bad PSU or the MBD is grounding out to the chasis somewhere (solution to figure that out is take the mbd and cards out and lay it on a non-static inducing substance and turn it on). If it works its not a ground issue but more than likely a PSU issue unless of course the wall plug or strip is bad.