If that doesn't work, the LCD screen needs to be replaced and should probably go to the repair shop since replacing the monitor can be delicate. If the computer displays on the external monitor, the LCD or internal LCD cable could be faulty.

I do have HP Envy M6 1216 Tx notebook and its brightness keys are not working.

It's the external monitor key and should tell your laptop to connect to the external display. HP Envy M6 1216tx Display :: Notebook And Its Brightness Keys Are Not Working Nov 28, 2014. Once your computer reboots, if it's not displaying on the external monitor, you may need to press the F4 key (or another key with a rectangle box with vertical lines on the left and right-meant to indicate a monitor) on your keyboard. Connect to the external display using a VGA cable or connect to a TV as an external display using an HDMI cable, depending on the connections available on your system. The hard reset should not clear any of your data from your computer, but it could clear out any driver or firmware errors that might be happening.Ĭonnect to an external monitor to test the LCD and LCD Cable. Performing a hard reset is not the same as factory resetting your HP laptop. Buy HP Envy All-in-One PC, NVIDIA GeForce RTX 2070, 10th Gen Intel Core i7-10700 Processor, 32 GB RAM, 1 TB SSD Storage, 31.

Hp envy brightness not working