issue in starting the laptop after change in motherboard

[Dev2445]

I recently changed mother board of laptop after that my laptop is not starting properly .while pressing the power button only one LED light is responding not the other one .

[WAWood]

While I understand WHY you did this, you are now presented with serious issues.  Why? Because the Windows product key for the preinstalled Windows was embedded into the firmware of the motherboard and when you replaced that, you basically threw away the Windows license as HP will not issue or sell you a second one.

You will have to buy a retail copy of windows that comes with a retail license and replace the Windows you have with that.

You will also no longer have the HP drivers when you install Windows as the new version will only install the MS generic drivers and some of the laptop hardware will not function properly as a result.  If you had come here BEFORE you did this, we could have told you how to do a backup of the HP drivers so you could restore them -- but it is too late now.