Dell Latitude E6400 Power is not turning on

[Najm Syed]

Hi,
I am using Dell Latitude E6400 from previous 3 Years, Yesterday I get problem there. I am not able to on it. Power Button is not working, if we connect the adopter then light of adopter turn off suddenly. I also have tried to on it by direct at adopter with removing of battery but result is same...Can you help me??

 

[Tmagic650]

Remove the battery and the AC adapter. Hold the power button down for 30 seconds. Connect the AC adapter only and see if the laptop powers up. If it does, re-install the battery. if it again won't start, the battery will need to be replaced