Why doesn't my suspension fork rebound after being compressed? I use a RockShox SID suspension. After using it for a while I noticed the suspension has not been rising back out on its own. I have to lift the front fork of the bike for the suspension to go back to its resting form. I would appreciate if anybody could tell me what's wrong with my suspension and how I could fix it. Thanks.
Sounds like you have debries blocking the valve at the rebound chamber. Even if you have no air pressure in the chamber(that means 1 atm) it should still have enough force rise back again after being compressed.

I for once bought a "White Brothers DH-2" which was mainteined recently, or that's what they told me. One day it got compressed all the way(15cm+3cm kit) and got stuck. I opened the tubes very carefully, you know because springs. The "mechanich" sleeved the springs in a piece of rubber(in fact was a cuted out wheel tube) and with friction pieces started to come apart and made it's way to the rebound chamber, forming a plug.

Cleaned it up good, lubed up the seals and changed the oil. Stuff felt like new afterwards.