White screen in Windows 10

Always include exact PC model in your posts...

There are no soft fixes for LCD backlight failures. Its not white its reddish orange with other colors.

Replacing an LCD on an All in one is too expensive and not for the average user.

This is not something that is worth fixing if your model is out of warranty.

Which is why its better to buy a micro model that mounts to the back of a monitor so that when the monitor dies you can simply replace it.  Replacing an LCD on an All in one is too expensive and not for the average user.

Which is why its better to buy a micro model that mounts to the back of a monitor so that when the monitor dies you can simply replace it.

Please provide a model number. 

Reboot to BIOS (F2) can you see the issue in there too. Yes replace LCD . 

Or use an external monitor. (much cheaper) 

Thanks.  Tried that as well as running Windows update, firmware update and all drivers.  Nothing seemed to fix it but over recent days, it has improved to a point that we can use it.  I must say though, we purchased 5 of these only a few years ago and two screens have now had issues with one needing to be replaced altogether.  Simply saying a solution is 'replace the LCD' which costs $1000 is unacceptable.  $2000 machines should last longer and I won't be buying Dell again.

You still didn't provide the model number

Some AIO in Dell has known to be defective LCD and have a tool to update firmware 

So please provide model number