Dell laptop not turn ON

Hi,

Charger working perfectly. But, light indicator on the charger is OFF when i plug the charger into my dell laptop. and also Laptop won't turn ON, no light's etc.,

I checked my charger to use on other laptops. Its works very fine.

I borrowed my friends charger and plug it into my laptop, same result happening (charger LED light OFF, and laptop won't turn on)

i thing, May be problem in reverse voltage or motherboard. But, i,m not sure about this.

Help me to solve this issue.