Laptop is on but monitor shows no signal

[problematic12]

My laptop's LCD is broken (according to repairman because my laptop starts up with a permanently white screen) So I connected it to an external monitor and it works! But the next day, my laptop starts up with the same white screen but this time, it turns completely black. And now, the monitor shows "no signal"

Please please please help!

 

[jarotech]

Hi, it will be helpful to know the make and model of your laptop.