Fixing this kind of hardware conflict is one of the main reasons drivers are updated in the first place. If you've had a problem severe enough to need a hard restart, it's usually a good idea to run Windows Update and HP Support Assistant just to make sure all of your drivers are up to date. You might need to change its configuration, or update its driver, to make everything run properly again. If one of them crashes your computer again, you've probably found your culprit. To remove the OSD Lockout message, release the Power button (if something was pressing against it), and press and hold the button again for about 10. Please check the User Guide for your monitor to find the exact procedure if this procedure does not work. Once it's up and running, you can start attaching your devices one at a time. The button, the button location, and the procedure may be different for different monitors.

Your computer should finish booting normally. Choose Start Windows Normally, and press the Enter key. Your computer may start up normally, or it might give you a startup menu and ask if you want to boot in Safe Mode. Instead, turn on the laptop without any extra pieces attached. If your laptop won't start because of a conflict with one of your external devices, re-attaching it just means you're going to have the same problem.

Your next step is to turn the computer back on, but don't re-attach any of your accessories just yet.

Hp pavillion power button