Run diagnostics (F12 immediately at boot) and watch for any adapter or battery issues. But at 8 years old the battery is probably well past the time when it should have been replaced. 

Hi,

Thanks for your kind reply. My battery is new one, dell brand and just 3 days older. Ran diagnostics, found no problem and all tests passed. In Bios it says, "your battery is working normally" , in battery health meter, it says " battery is excellent" . But still, not charging. With battery and no  AC adapter, my system is not starting up & not working. Your suggestions please.......

Thanks!

There are few basic step we would like for you to try .

1- Please the same adaptor on a different system to check if works fine and try a different adaptor on this system.

2- You may drain the residual power of your computer and re-calibrate the battery by following the steps below:

a.Power off your computer.

b.Remove all the external peripherals (printers, scanners or any other USB device) connected to your computer.

c.Please remove the AC adapter and battery of your computer.

d.Press and hold the power button of your computer for 10-15 seconds to drain the residual power.

e.Release the power button

f.Keep the battery out for at least 2 - 3 hours.

g.Then insert the battery and charge it overnight with the system powered off.

h.Insert the battery in and connect the AC adaptor.

i.Then power on the computer and see if it works.

Kindly try the following step to check if it works fine.

Hi Adrian,

Thanks for your kind reply. I followed your steps but still same issue, "battery is not charging".

Best regards,

ramesh sakthi