When you press the start button nothing happen not light or start up

First remove the battery and put it back in, you want to make sure it has a good connection.

Next you want to check the power adapter. If it has a built in LED light, it should turn green when plugged into the wall. If it does have a light and the light will not turn on or it blinks, replace the adapter. Next, plug the adapter into the computer, does the LED light change? Example, the LED light was a solid green, when you plug it into the computer it blinks. If the light does something along those lines, then there is a problem with the laptop itself.

If the power adapter does not have an LED light, then you need to use a Multimeter to check if the adapter outputs the right amount of power...which should be around 12 volts.

If the battery and power adapter pass the tests, then you are looking at a hardware issue in the laptop. From your description of the problem, I would guess the motherboard has died or that the charging jack on the motherboard came loose and needs to be replaced or re-soldered.

Two things that would stop the light from coming on, No Power or Motherboard is broken.