Woof:
I see from your profile that you have a 2002 Adventurer. Just a guess, but if the pump is running and your jacks and rear slide work, the extend solenoid for your living room slide may have failed.
As already suggested, you might want to call HWH Corporation in Moscow, IA and ask for the tech guys. They usually take a message and have someone call back but they are very helpful.
By the way, I was born and raised in Mechanicsville..lived on Fullview Ave off Atlee Road.
Let us know what you find about your slide.