1. Lock keyboard function: Check whether there are function keys (generally "F 1 1") on the keyboard, which may have a lock icon on it. If the keyboard is locked, pressing the lock key while holding down the function key can unlock the keyboard function.
2. Keyboard driver problem: Sometimes, there may be problems with the keyboard driver, resulting in the keyboard not working normally. You can try reinstalling or updating the keyboard driver. You can update it by visiting HP's official website and downloading the latest keyboard driver for your laptop model.
3. Hardware problems: The keyboard may have physical connection problems or faults. You can try reconnecting the keyboard cable (if possible) or contact HP technical support for repair or replacement.
4. Operating system settings: Sometimes, the settings of the operating system may cause the keyboard to be invisible or not work properly. You can try to check the settings by following these steps:
-In Windows, open the control panel and select the region and language.
-In the "Region and Language" menu, select the "Keyboard and Language" option.
-In the Keyboard and Input Method tab, make sure that you have selected the correct keyboard layout and input method settings.
If the above methods can't solve the problem, it is recommended to consult HP's official support or seek the help of professional technicians. They can further diagnose the problem and provide appropriate solutions.