Please check on you tube as lots of videos on dismantling GHD. Although it could be the cable it could also be a R8/R11 resistor which needs replacing, if you can use a multimeter and soldering iron it is worth checking these. 
If you require a repair service we offer this for £19.50 with 3 month warranty at www.siriushair.com
                
 siriushair
                
 February 2015