I would suggest few steps would which would help us in isolating the issue further:
Please let us know your findings.
Is the led light on the a/c adapter on before you plug it into the laptop?
Once you plug in the a/c adapter and press the power button on the laptop does the led light
on the a/c adapter go out?
Please let me know if you have tried turning on the computer with a know good AC Adapter. If not, please try and check how it goes.
In this case, it can be an issue with the DC-in module. Please consider replacing it (Part # WXHDY). Does the computer have an active warranty? You can check the warranty status here. In case of expired warranty scenario, we would not be able to extend warranty entitled services. If the warranty on the computer has expired, you may contact our Expired Warranty Services (this is for US based customers).
Please write back if you have any further questions.
how can its DC in module be faulty when it is showing charging on light and also light doesn't go off after plugging charger cable into laptop ?????? Also i don't have warranty so can i get it repair from dell ,I can pay all the charges.also please tell me what can be the cost of repairing if possible
Please contact our Expired Warranty Services (this is for US based customers) for the estimated price to get the computer repaired.
Hope this helps!