Question Hp Elitebook 8570p internal display not working

[someone2902]

Need help,

My Hp Elitebook 8570p , internal display not working, but OK using external monitor
Here some troubleshoot i've done :

1. Change panel display with working display from other laptop , not solved
2. Change cable display, not solved
3. Update latest bios, set to default bios, not solved
4. Power on with or without battery, not solved

5, Change ram, not solved

Any other idea to tried my problem?..please advice

Thanks

 

[hang-the-9]

The display you used, was it from the same model laptop?

Could be an issue on the motherboard since you changed the screen, or with the video chip. Does this system have multiple video cards?

 

[someone2902]

The display you used, was it from the same model laptop?

Could be an issue on the motherboard since you changed the screen, or with the video chip. Does this system have multiple video cards?

thanks for your reply
yes..same model.
no..i see in bios using ati gpu..not multiple (via external monitor)
if gpu problem..should be cannot use external monitor , right?