Change Cord On Bathroom Light Switch Bathroom Light Is Knackered!!! HELP?

Bathroom light is knackered!!! HELP? - change cord on bathroom light switch

I have the installation of lighting in my bathroom, there were 5 red, 4 black, 1 blue and 5 land-, i-Cable, as it was before, but now the light is always to use and unplug the power cord to turn it off is within easy travel light fuses on the motherboard. It is an exhaust fan in the bathroom, but since I do not see the light changed. I have also tried to put back the old plant, but the same applies ..... I'm in trouble, please help