Ctd 130 fork

A mate just bought a 2013 trek fuel 8 secondhand never been ridden all was good untill first trip out playing around with the settings on his shock and fork .He forgot to to go back to trail or descend and left it in climb for a short run down hill in margs under the pines no big jumps .Problem now is when you turn the lever on top of the fork it makes no difference to how they operate.Unfortunatly he never got the warranty paper work when bying the bike any ideas what has happend