Ghd light flickering?

Would love an answer to a faulty connection with my Ghd,s
This problem last happened about 2 years ago and they have been working well ever since until now where the light flickered and went off loosing complete heat. I have changed the fuse and unscrewed what I can. They came on for a few seconds and the light went out again. Any ideas? Does the plug come completly appart so I can check the wires or is it a complete unit.
Model no 3.1B