Originally Posted by Speedbump
Do you have a water softener or one of those so called "Whole House Filters" in your plumbing?
Another real good possibility!
Basically you have something that is not letting the water pass in any substantial volume.
It could be anyplace from the supply coming into the house to the points where you see the problem.
You need to find and fix it, or, hire someone who can...
One thing for sure is this cam only be troubleshot at your home.
I would go at it in a systematic manner to determine where the problem exists.