Hp 8460p won't start. When i insert the battery or insert the power cable in flash light comes up

[Ab7mmm]

hello, my laptop is not turning on when i insert the battery or plugin the charger.

Flash light shows up turning white and orange immediately when i insert the battery without pressing any key. 

When i remove the battery and plug in the charger same light shows up.

I have tried 30 sec, 1 minute holding power button method. It didn't work and i have cheked the battery its working on other laptop and charger is also working fine on the other laptop. 

What's the problem with my laptop please tell me how can i solve this issue. 

Best regards. 

[Lil_Boy_Blue]

Hi

Dunno.

https://support.hp.com/us-en/document/bph07107

First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

NOW begin checking/testing/proving the Hardware is fit for purpose.

Power on your PC, press ESC (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).
AND/OR
HOW DO I USE DIAGNOSTICS?

HP PC Hardware Diagnostics Windows is a Windows-based utility that allows you to run diagnostic tests to determine if the computer hardware is functioning properly. The tool runs within the Windows operating system in order to diagnose hardware failures. HP PC Hardware Diagnostics Windows comes pre-installed on new HP computers, but if not on yours, download here:- http://ftp.hp.com/pub/softpaq/sp93001-93500/sp93457.exe