My daughters lights. my daughter has just moved into a house she turns on the bedroom lights and

Question

my daughter has just moved into a house she turns on the bedroom lights and they dont work.but if she puts the toilet light on then they work. i have checked for power and there is some but if you turn the light out then there is no power at all the switch in the toilet is dead but turn it on and the power is there.regards glenn. [e-mail] ps i know that its not the catagorie but i need help