I still feel this topic is still relevant, since there didn't seem to be resolution on his MMr not powering up. And chiming in here because I just picked up a minty MMr LE (2015 rev) and plugged it in, and nothing, nadda, no boot, no lights..I need to look at the backbox to see what the watchdog leds are doing, if anything..one thing that may have happened, is I slightly crimped the power cord, when I was raising up the backbox (the cord was hanging in that area), so maybe I broke one of the wires on the main cord (which I think it unlikely-it didn't really even mare up the outside sheathing, but still a possibility). It was running just fine, before I brought it home last Sunday. Any thoughts? reset it? I'll check for loose connections as well.

you could be very right, here..I'll take the back cover off..because now that I think of it, when I was putting tension on the power cord, it most likely slowly pulled it out, behind the plate..I'll get back in a few! And thanks!

sure as shit, that's what it was..many thanks..I've never had an issue like that before, but my deduction on the cord being pulled definitely lined up with your wisdom..that plate can be very decieving!!! (thinking it's all good behind there)...prob solved cheers!