System Error E68

Lately whenever I turn on my xbox it goes as usual, but then the red flashing light comes and it says that a system error has occured and it shows "E68" and a red ring shows around the power button with one wedge on the lower right hnad side.

I turn off the xobox and then run it on again, and it starts normally.  Any ideas what the problem is?  Anything I should test or do differently?

You, my friend, have just been RRoD'd.

Send the console in to MS, and they'll send back a new one.  The RRoD means that there was a hardware failure.