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Call HP's technical support
If you purchased your laptop from HP, you can contact their technical support on 800-407-4005, 8:00 AM - 8:00 PM ET Monday - Friday, and tell them more details about the issue. They will help you resolve the issue as soon as possible.
If you're not from the United States, you can find the correct support hotline on their website.
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.