will and wont work?

My GHD will work and it wont work?
I have my GHD Straightener for more than a year now and its been working well. But as from last week it has stopped working in my sockets. I took it over to my dad to see if he could fix it' as soon as he plugged it in it worked. I took it back home and it still wont work in my sockets. My sockets are OK' my tv works off them and so does my hair-dryer. Would anyone know what is causing this.
Thanks.
Amanda