When I first received my 2011 Mac 2 weeks ago it was DOA. While on the phone with tech support, I turned the unit over to get the serial number. After standing it back up I was able to power it up. This morning, it wouldn't power up again. This time, unplugging and re-plugging the power cord allowed it to start up. It looks like a trip to the Apple store is in order but I was curious if anyone else has had similar issues.