OK, help us help you by beginning with a few basics...
1) Have you checked the fuses in the power box to ensure it's not just a blown fuse?
2) When you push the button to retract it, are you hearing any nosies whatsoever? Like that of a motor turning, or gears clashing, anything? How about if you push the button to extend it further... any nosies then?
3) Do you know if the slide is driven by cables, or gears & tracks? In other words... do you see any belts, cables, or chain on the underside of the chassis by the slide out, or maybe aluminum tracks on the exterior side-walls of the slide out?
2013 VOLTAGE 3200 (EPIC I & II)
2014 Ford F-450 PLATINUM