Bank of wall outlets not working
If the line from the wall to the power source is good, and the power source is good, then the problem will be in the wall.  It's hard to imagine how something could go wrong between the top of the wall and the outlet, but I had this very problem once and traced it to a mystery, unclosed box with the two unterminated wires in it in the middle of the wall for who-knows-what reason, completely hidden by drywall.  

Is there a switch on this wall as well?  If so, the outlets are probably connected there to the power source.  If not, your best bet may be to start at the outlet and trace the wire back to the source through the wall.  This will involve removing wall covering, and the repairs and cleanup that that entails.