Ways to know if its Screen or motherboard issue in Laptop

No Screen output even during the POST (immediately after power it ON)?

Press F10 more times immediately after powering ON in order to enter the BIOS. No Screen?

Turn on the laptop and then try to ping it and connect via RDP. You will connect if the screen is broken.

Hi Expert,

No screen at all upon power on. F10 still same. What do you mean by ping it?

Thanks!

If you have nothing on screen or when connecting an external monitor, it's most likely the motherboard. Sounds like all it's doing is powering on, which just means your power supply works.

You can try reseating the RAM and see if it helps. Or remove the RAM and try turning it on to see if it even beeps at you.

Did you try to connect via RDP?

no video on post.. no video on external monitor .... laptop faulty.. If just the screen was bad you'd see something on the external monitor. windows key + p to select monitor
Laptop may have a Fn key to enable external monitor. 

If somehow you have Windows server installed on your laptop, then you would have RDP enabled by default and you can try RDP.

RDP is not on by default on Windows 10 and won't work if you didn't set it.  It's also not available on Windows Home edition.

was the external,screen connected when testing power up screens ? plse do so
check also HP suggestions out :  HP Notebook PCs - Computer Starts but Screen Remains Blank (Windows 10, 8) | HP® Customer Support 

Hi Expert,

Thanks for the kind support.

Now the laptop totally can't boot up, but have light when power adapter plug in. External monitor still does not work, remote also dont work, Can I said the motherboard is faulty?

Thanks!

probably - yes
i usually dismanle it, and remove all removable devices : cd drive, disk, extra ram etc
 for a last test

You might still recover Hard Disk Data attaching it to a working System.