my guess is one of the wires on one of the outlets came loose - it may not be one of the four that are not working either - it could be the one before the first one that isnt working - I know they use the part where you stab the wire in the hole and it stays versus taking the screw loose and twisting it around the screw for a more positive connection.
(Black (Hot) wire goes to Gold, White (Neutral) wire goes to Silver and Green (Ground) wire goes to Green)
I always remember it as Black Hills Gold which is what someone taught me a long time ago.
I would shut the breakers off when you work on the outlet so you do not get shocked and especialy do not touch the black and white wire together or you will get a nice blue spark -
if you have a Multimeter you can verify if you are getting a low voltage condition or no voltage to the dead receptacles.
Like f1100turbo said if you do not have a Multimeter - now would be the best time to get one. Flukes are nice but very pricey - a $20 meter will do what you are looking to do.
2011 Rockwood Mini Lite 2306 - Matt
2004 Dodge Ram 1500 Qaud Cab 4x4 with 35" tires and 3.92 gears, Dynatech Longtube Headers & Fabtech 6" lift + Superchips with shift Tuning
Nights Camped 2011 (37) - 2012 (16)-2013 (2) -2014 (5) -2015(0)
USMC 91 - 95 - F/A-18 Aviation Ordnance