Did you see "Touchpad Disabled" on your screen when you chose Fn-F9? If not, it may be a driver problem.
If other Fn keys are not functioning, you may need to install the ATK Package. Current version is 1.00.0014.
Do you have a Sentelic or Synaptic touchpad? If you can't telll, go to Device Manager, expand Mice and Other Pointing Devices, right-click on the mouse device and choose Properties from the popup menu. Select the Details tab and choose Hardware Ids in Property. If STLC is displayed in the Value, you have a Sentelic touchpad.
I recommend you uninstall your current touchpad driver and reboot. The touchpad should then display the Microsoft touchpad driver in Devices. Download and install the latest Sentelic or Synaptic driver, depending on which touchpad is on your laptop.
Fn-F9 will then hopefully function as designed. The Sentelic 9.1.7.7 verson also has a configuration option to disable when a USB mouse is detected. I suspect the Synaptic driver has a similar configuration.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT