Help with a failed enclosure

I’ve had my My Book World Edition II (blue rings) for three years + one month, no problems…until now.

I have the same problem as above, it won’t start.  (I turned it off when I left for vacation and it won’t turn back on.  It did come on once, I was able to read and write to it, then the rings started blinking alternately.  I turned it off, let it cool down, and now it won’t restart.)

I tried taking one drive out and starting with only one drive (first A drive, then B drive), but no help.  I tried plugging the power supply directly into the wall, no help.  As above, the ethernet light comes on, the power supply cord light comes on, but the enclosure does not come on.

Any suggestions?