Gears wont shift down

*Gav*
*Gav* Posts: 10
edited June 2011 in MTB workshop & tech
Hi
I have a carrera Vulcan and just recently it has developed a fault,on the front crank my chain is on the top cog and whenever i attempt to shift down it simply doesn't happen.
The front derealier also doesn't move when i do this,the gear cable goes baggy but tightens back up when i shift it back up.

Any help on what could be the problem here and what to adjust?
Thanks in advance.

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