More info in here:
It would be helpful if you could say how it happened, were you using batteries? Were they rechargable or regular disposable batteries?
It seems that the issue is with the battery voltage dropping below the threshold for the regulators and causing the impedance to rise, resulting in the power supply getting hot and the inductors burning out.
From what I can gather the permanent damage only seems to be caused from using rechargable batteries, mine still works with PSU or battery pack plugged into PSU connector but it does not with AA batteries properly any more.