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Use an USB mouse
If your laptop's touchpad isn't working when you try to use it and you have tried everything else, and if you diagnosed that the touchpad itself is defective, and nothing can be done to fix it, use an USB mouse. USB mouses have a USB port and are mostly used by laptop users.
If your laptop's touchpad isn't working when you try to use it, you may have accidently pressed the keyboard shortcut combination (Fn + a key), or the dedicated key which disables the touchpad. Also, if you have recently upgraded your laptop to Windows 10, it is possible that your touchpad is disabled. All you need to do in both cases is to enable it.
You can enable the touchpad using keyboard shortcuts (key combinations on the keyboard, e.g. Fn + a key), or via the operating system itself (Windows, MacOS).
Start -> Control Panel -> Mouse -> Click on the touchpad tab (Synaptic, Elan and etc.) -> Enable the touchpad
Start -> Settings -> Devices -> Mouse & Touchpad -> Scroll down to Related Settings and click Additional mouse options -> When the mouse properties window pops up, click on the ELAN (or SYNAPTIC) tab -> select your device and click Enable
Click the Apple logo at the top of the screen -> System Preferences -> Universal Access -> Select the Mouse & Trackpad tab -> Trackpad Options -> clear the Ignore Built-in Trackpad checkbox
Maybe an external USB device (e.g an USB mouse) automatically disabled the touchpad. Turn off the laptop, disconnect all external devices and then, turn it on again.
If the touchpad starts working, that means that one of the external devices prevented it from working properly; however, if your touchpad still doesn't work, then something else is the problem (check out the other solutions).
If you have the touchpad not working issue and your laptop is no longer under warranty, you can take it to a computer repair store (don't take it to a computer repair store if it still is under warranty because you will lose your warranty rights). The repair guy will diagnose and solve the problem.
The HP Probook series have an indicator light near their mouse pads, or the touchpads. Its main function is to keep your laptop safe. If the yellow/orange/blue light is ON, it indicates that your touchpad is locked. When it's locked, you cannot move the pointer, i.e you can't use the touchpad at all.
To unlock it and finally fix the hp laptop touchpad not working issue, double-tap the sensor located near the touchpad, or the touchpad's upper left corner and as soon as you do so, the light will switch itself off.
If you use a laptop, and the cursor's movement is erratic, or it does not move at all, try cleaning the touchpad with rubbing alcohol.
Make sure the touchpad (and your fingers) isn't dirty and doesn't have liquids or food on it, because the touchpad has to make a good contact with your fingers (i.e. feel them), in order to work correctly.
Maybe a program you recently installed prevents your touchpad driver from functioning properly or is responsible for the touchpad scroll not working issue. Cleaning the registry should help you solve the problem.