27" LED Display with power issues

I have had some peculiar issues with my ACD since I received it about a month and a half ago. I use it with my new i7 iMac. Specifically, the issue is with the power supply inside the unit (I think). One night about a month ago, I heard a "pop" from behind the ACD, and it went black. I knew that the unit itself was fully powered down as I could get nothing from any of the USB ports (such as charging of my iPod). I swapped power cables with my iMac, and the iMac powered on just fine, so I ruled that out. I then left the unit unplugged, boxed it up, and took it to the Apple Store the day after. To my surprise, it powered up just fine when I got there. Sure enough, it worked again when I brought it back home.

Now, just last night, I switched off the breaker panel to the circuit that had the ACD on it to change a light fixture. When I turned it back on, I powered back up my iMac...and the ACD did not turn on. Same thing: all ports dead, no power at all. Left it unplugged for 2 hours...no results. Then, I left it unplugged over the entire night. When I woke up, plugged it back in , and now it works again.

It seems as if the longer amount of time allows the power supply inside to "reset" somehow or something, but I am at a loss as to if this is some sort of true defect, or a flaw in design. Even the instruction manual recommends leaving the unit unplugged for a while if it fails to power on.

Anyone have similar issues? Anyone able to help me figure out what is going on?