Laptop doesn't recognize own screen.

[Nathan Breese]

I had my laptop (Toshiba Satellite) hooked up to my TV by HDMI. When I unplugged the HDMI, my laptop screen did not light up. I haven't been able to use my laptop screen since, and my device manager doesn't show it as an option. Still works fine when hooked to any external display from any port. I have already confirmed that it is not a burnt out backlight, projection setting issue, or brightness setting. Are there any other options, or is my screen just dead?

[IrishJ]

It's a hardware defect or a loose cable.

 

When Hardware defect either the internal display is dead or the inverter on the mainboard (which translates to new mainboard).

[Kirky2k15]

6 minutes ago, IrishJ said:

It's a hardware defect or a loose cable.

Not necessarily....

 

What OS are you running???

 

When I plug an external monitor into my laptop the laptop's own display is hidden in device manager.

 

Start by connecting your TV via HDMI with the laptop screen closed. Boot into windows (assuming you are running windows?) and get to the desktop

 

Then open your laptop screen whilst it is still connected to the TV

 

Then right click on the desktop and click display settings

 

This is what I get when I open my laptop up

 

This is what I get when I close the screen:

I've got 2 1080p monitors connected.

 

[Nathan Breese]

11 minutes ago, Kirky2k15 said:

Not necessarily....

 

What OS are you running???

 

When I plug an external monitor into my laptop the laptop's own display is hidden in device manager.

 

Start by connecting your TV via HDMI with the laptop screen closed. Boot into windows (assuming you are running windows?) and get to the desktop

 

Then open your laptop screen whilst it is still connected to the TV

 

Then right click on the desktop and click display settings

 

This is what I get when I open my laptop up

 

This is what I get when I close the screen:

I've got 2 1080p monitors connected.

 

 

22 minutes ago, IrishJ said:

It's a hardware defect or a loose cable.

 

When Hardware defect either the internal display is dead or the inverter on the mainboard (which translates to new mainboard).

Thanks for the info. It isn't a display setting issue; I have confirmed that already. I will check to see if a cable is loose, but I doubt it. If I remove the screen, is there a way of testing it to see if it is bad?