I have an old dell xps 15 9550. I have it connected to 2 external monitors, a samsung 32' 4k monitor and an asus 24' 1920x1200 monitor. I use it plugged in almost always. For the last few months ...
To fix the Power Button Lockout message on your HP Monitor, follow these suggestions: Check if the power button is stuck Disable the Power Button Lockout function Reset the monitor to factory settings ...