Laptop screen won't turn on, but works with external monitor.

[Charger760]

Hello, my laptop screen won't display anything. It boots up and displays perfectly through an hdmi and my T.V.. I can't adjust my screen brightness either, nothing comes up when I use the brightness function keys, the other function keys work fine. I went to device manager and everything under Monitor and Human Interface are updated. Under Monitor the device is Generic PnP. I'm on an Asus laptop, Windows 8, 64 bit. I'd appreciate any advice.

 

[Charger760]

have you tried using the display function key, varies by manufactuer. you may have a dead monitor otherwise.

Yea I did, it's f7 for me and I also did Windows key P, tried dual monitor, single monitor and it always just shows up on my T.V. even when I do PC screen only. Thanks for getting back to me, I may have to just take it into a shop.

 

[diabolusss]

Hi there! i had almost the same issue with asus laptop. i was experimenting things on it and after i assambled it back the screen won't turn on in a such way: after boot up i see a bios logo and then windows booting image. after that screen turns off. connecting external screen i assured that pc is fine and windows is working(except the screen). by the way screen is working in bios without connecting external screen. So actually i dont have any soluting now, because i dont know the reason of failure, but i know that something wrong is in windows(i have the same windows 8 and 64 bit). And it's simple to check: first get to bios(you can go into it with external screen and then just unplug that -> if laptop screen turns on then smth wrong is in windows), second boot up from usb flash drive with live cd(i booted from ubuntu) -> it perfectly worked without any issues.

 

[AMDnNVIDIAgamer]

Hello, my laptop screen won't display anything. It boots up and displays perfectly through an hdmi and my T.V.. I can't adjust my screen brightness either, nothing comes up when I use the brightness function keys, the other function keys work fine. I went to device manager and everything under Monitor and Human Interface are updated. Under Monitor the device is Generic PnP. I'm on an Asus laptop, Windows 8, 64 bit. I'd appreciate any advice.

Had this same issue with a Lenovo T420 laptop; I cracked the screen and when I used the VGA cable to connect to an external monitor it just showed black.

REASONS: The monitor will display the Windows (or OS) logo until it boots into the OS because during the boot the motherboard displays output to the second monitor however once the OS is loaded the computer switches to Extended Display allowing the user to use both monitors (If they both worked)

SOLUTION: I was able to get the laptop to display only to the monitor when connected by:
1. Turn off computer completely
2. Connect the VGA cable to the laptop (output) and monitor (input)
3. Power on laptop and Immediately close the cover of the laptop completely shut

RESOLUTION: By doing these steps the BIOS will boot recognizing the monitor as the main and only output option allowing
the monitor to continue to work even after loading the OS (ie. Windows 8)
The laptop will be completely closed therefore you will need a usb or bluetooth keyboard and mouse in order to perform operations going forward


hope this helps
- CG

 

[Zeroram]

Whenever you have a blackscreen, and before you get all that "Change the screen, change the BIOS, Change this or that..

If your latop gets into windows on a monitor screen, means there is nothing wrong with the BIOS or anything related to that. so try this first.

1.If your laptop has a removable Battery- remove it

2. Unplug the laptop

3.Hold the power button for at least 10 and up to 30 seconds so the laptop can get rid of any "on hold power or static"

4.Plug the computer in

5. Power up the laptop.

You may get back your screen... if it didnt work. try this:

1.Put the battery back

2. Turn on the computer and let it stay until battery die...

3..Hold the power button for at least 10 and up to 30 seconds so the laptop can get rid of any "on hold power or static"

4. wait 3-5 seconds

5. plug the computer and try to turn it on.

if any of this didnt work... try using the laptop with a monitor and check for drivers updates. on some windows 8 and 10 the graphic card get disabled and change to default intel graphics.

so update that.

If that still didnt work... it may be the screen is dead..


With the first solutions i have fixed several HP, Dell and my own Alienware M17x (July 2013 version with windows 7)

 

[Garrett_36]

I woke up to Windows 10 having installed a new security update, and my laptop screen wouldn't display anything except for a few seconds of startup (BIOS) no matter if my external display was connected or not. Luckily my external display worked, so I was able to troubleshoot, the external display was the #1 display, there was no hint of my laptop screen in the device manager, but since I know it installed the update I went into the Windows Update History and just uninstalled kb3200970, about 5 minutes later after a restart and "installing updates" yada yada it worked perfectly again. The update details didn't mention anything about changes to displays so it's kind of odd, but the bottom line is my screen works again.

 

[Maddog2346]

This might be old but for anyone having this problem ( like i did) go into display settings and click on the 1st screen go down to muliple displays and hit extend desktop to this display.

 

[diabedo]

have you tried using the display function key, varies by manufactuer. you may have a dead monitor otherwise.

 

[HEXiT]

normaly means dead back light. try turning it on and shining a bright light into the screen if theres an image there the backligt is gone.

if not then its likely the connector between the screen and the motherboard. they tend to break at the bazel.

 

[Charger760]

normaly means dead back light. try turning it on and shining a bright light into the screen if theres an image there the backligt is gone.

if not then its likely the connector between the screen and the motherboard. they tend to break at the bazel.

I shone a light and nothing appeared. I just didn't think it would be a hardware issue since the laptops not even letting me use the brightness function, it's almost like the laptop doesn't recognize that there's a screen. Well I might just take it into a shop since it has no warranty. Thanks for getting back to me.

 

[HEXiT]

taking it back is the best option as it sounds like the connection between the screen and the motherboard has broken, cutting the power to the whole of the screen.

reason i said shine a light into the screen (i meant press it up against the screen and look for an image from the reflected light).

 

[Chullachaqui]

I had the same exact problem. After tring everithing, including driver reinstal and system restores, I shut down the laptop and surrender, thinking about how much a new screen will cost me BUT after a couple of hours, I just turn it on, and everything works as usual.

My theory: that was a busy day, I had the laptop working for 12 hours, so maybe something overheated. Just let your laptop rest in a fresh place for a while and try again.

 

[techfan01]

Hi, I have a dell latitude E6420. It has the same blank screen problem but with working hdmi function. When i use the brightne

 

[Toottoot4]

Hello, my laptop screen won't display anything. It boots up and displays perfectly through an hdmi and my T.V.. I can't adjust my screen brightness either, nothing comes up when I use the brightness function keys, the other function keys work fine. I went to device manager and everything under Monitor and Human Interface are updated. Under Monitor the device is Generic PnP. I'm on an Asus laptop, Windows 8, 64 bit. I'd appreciate any advice.

Had this same issue with a Lenovo T420 laptop; I cracked the screen and when I used the VGA cable to connect to an external monitor it just showed black.

REASONS: The monitor will display the Windows (or OS) logo until it boots into the OS because during the boot the motherboard displays output to the second monitor however once the OS is loaded the computer switches to Extended Display allowing the user to use both monitors (If they both worked)

SOLUTION: I was able to get the laptop to display only to the monitor when connected by:
1. Turn off computer completely
2. Connect the VGA cable to the laptop (output) and monitor (input)
3. Power on laptop and Immediately close the cover of the laptop completely shut

RESOLUTION: By doing these steps the BIOS will boot recognizing the monitor as the main and only output option allowing
the monitor to continue to work even after loading the OS (ie. Windows 8)
The laptop will be completely closed therefore you will need a usb or bluetooth keyboard and mouse in order to perform operations going forward


hope this helps
- CG

 

[Toottoot4]

Thank you so much, CG!!! It worked!! Thank you, Thank you, Thank you!

 

[Master_H]

Gracias!!
funciono perfectamente en Dell E4300 con windows 10

Solo puse a funcionar el monitor con VGA y luego cerré el laptop inmediatamente
y listo funcionaron los dos!, no mas pantalla negra!!

 

[please_answer_this]

Hello, my laptop screen won't display anything. It boots up and displays perfectly through an hdmi and my T.V.. I can't adjust my screen brightness either, nothing comes up when I use the brightness function keys, the other function keys work fine. I went to device manager and everything under Monitor and Human Interface are updated. Under Monitor the device is Generic PnP. I'm on an Asus laptop, Windows 8, 64 bit. I'd appreciate any advice.

 

[please_answer_this]

hey charger760, did you ever find the solution to your problem

 

[hwmads]

hey charger760, did you ever find the solution to your problem

I have same problem with ASUS s400c some time after updating to Windows 10.
Bios and safemode can use laptop display, but during normal boot Bios logo moves from laptop to external hdmi or vga. The external monitor is primary display but extending it to other display in laptop does not turn it on. dxdiag shows both monitors as working. All drivers are updated but I guess next step is to reinstall windows 10 :-/

 

[Don_15]

Hello, my laptop screen won't display anything. It boots up and displays perfectly through an hdmi and my T.V.. I can't adjust my screen brightness either, nothing comes up when I use the brightness function keys, the other function keys work fine. I went to device manager and everything under Monitor and Human Interface are updated. Under Monitor the device is Generic PnP. I'm on an Asus laptop, Windows 8, 64 bit. I'd appreciate any advice.