HP Laptop no screen brightness

[tob_ewalker]

Hello,
I have had this issue on other laptops, and fixed it using regedit, but can't remember how to do it :/
I have a Windows 10 HP laptop with 0 screen brightness (literally need to shine a torch on the screen to see anything). It happened after a Windows update. The screen brightness adjustment using F2 and F3 brings up the brightness slider (and moves it) but has no actual effect on the screen brightness. It's almost as if the back light has gone (it may have done, but as I have had the issue before being a software issue, hopefully it's just that).
Any help gratefully received
Many thanks
T

 

[t53186]

What happens if you connect an external monitor? if you can

 

[tob_ewalker]

I can't unfortunately. Only output is HDMI and the monitor I plug it in to (via a converter) is VGA, and says the input cannot be used :/

 

[t53186]

It's likely the backlight for the display, but you can try resetting bios to factory defaults (this has even fixed a wifi adapter problem).

If you choose to try this write down your boot setting, boot drive order, achi or raid before resetting to factory defaults.