why the lights doesnt appear both in the scene and the game?

at first they worked.then i created a new project and they dont work anymore.the whole scene area gets white.i reduced the intensity and range but it still completely white and it doesnt appear in the game!what should i do?

It sounds like it is the quality settings, make sure that under the quality settings tab that the Pixel Light Count is greater than 0 and see if that works.