Hp pavilion dv6 laptop black screen

Hi all please is any one help me I have my hp pavilion dv6 laptop.
The laptop is working,have the necessary sounds after i
turn it on,but the problem is that the screen stays always black
..I connect the laptop to external monitor and it shows that everything is working properly. But It not working on laptop screen what should I do heplllllll

Hi
I'll try helping you with this,
You'll have to give it for repair - display assembly replacement. The display panel might be at fault here as your system works good when connected to external monitor.
But before that,
Do a hard reset first --
Turn off the computer by pressing SHIFT KEY while you click SHUT DOWN.
Remove the computer from any port replicator or docking station.
Disconnect all external connected peripheral devices such as USB storage devices, external displays, and printers.
Unplug the AC adapter from the computer, shut down system.
Remove the battery from the battery compartment.
Press and hold down the Power button for about 15 seconds to drain any residual electrical charge from the capacitors that protect the memory.
Insert the battery and plug the AC adapter back into the notebook computer, but do not connect any of the peripheral devices.
Press the Power button to turn on the computer.
Next:
To confirm, connect it to other monitor & do a full extensive hard drive & memory test from BIOS, tap quickly F2 or F10 soon after powering on the system.
If all tests are passed, contact HP service center.
thanks,
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