try keying the code again,if it turns it off,it should turn it on,unless.its been programmed engineer reset only,then you would need the engineering code,if your number not work,try key in 07890,if engineering code not been changed,it should say installer mode,if it does,key in 99 then press enter,( the tick) it will ask if you want to leave engineering,press the tick again,it will now say checking system,then it will be reset.
gts, December 2011