I am a long way from my manual right now, but I remember two things, make sure your battery switch is turned on, and My slide wouldn't go back in while the motor was running. It might have to be in park also, but not sure.
There is more information here in the forum. It will be Tuesday before I get home and can check my manual.
On the green bar on this page ( first word is Portal) you can find the forum search feature. Click on Search and then Advanced Search, you can refine your search to just search Georgetown.
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2012 Georgetown 360
SHE wanted "a new motorhome"
As with the previous poster, check your circuit breaker at the battery box. The large 50 amp mounted to the frame. If your slides are hydraulic this breaker may have tripped. It is the same breaker that is used for the jacks.