What type of jacks do you have (HWH kick down?)?
Are all the jacks inoperable or just one or two?
Can you hear the pump running when trying to extend them?
Does your jack system have a control panel and ifso are the lights on?
Bobby - I'm not familiar with Power Gear jacks, but hopefully the below link to one of their troubleshooting guides will be helpful. Page 5 suggests the problem may be caused by a blown fuse (probably in-line) at the pump, or a weak battery. Good luck. - Dave