S431 Touchpad stopped working

I'm using S431. The touchpad suddenly stopped working today.
In lenovo solution center, I see this:
but in Win8 Device manager, I dont see any disabled device:
When I try to open Mouse setting in Control panel, I got this:
If I click yes, it will uninstall "Synaptics Pointing Device Driver". If I click no, mouse setting will be opened, but there's no UltraNav tab in the setting.
I tried to uninstall "Synaptics Pointing Device Driver" and reinstall it, didn't work.
Anyone know why this happends? thanks!

I should have asked this before but I assume you are aware FN+F9 enables and disables the touchpad. Also, you have a switch in the keyboard bezel just above the TouchPad that turns the pad on and off. That switch can be very hard to see because it is recessed in the bezel and the same color so look very closely.
BTW, since you are now using a wireless USB mouse, make sure in Mouse Properties that a box that says Disable internal pointing device when external pointing deviceis connected is not checked. You can find that box at Control Panel/Mouse/Device Settings.
C.B.
Toshiba Sat. C75D-B7260 Win 8.1 64 Bit--Toshiba Sat. L775D-S7132 Win 7 HP SP1 64 Bit and Win 10 PRO Technical Preview--Toshiba Sat. L305-S5921 Win Vista SP2 32 Bit

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Dear Customer,
Welcome and Thank you for posting your query on HP Support Forum
It looks like you are facing difficulties to resolve Touchpad Issues with your Notebook
We will surely assist you with this
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Step 01. Turn OFF the Notebook
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Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
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This question was solved.
View Solution.

Hey Stan,
This may actually fix it and it is easy to do:
Notebooks- Power Reset to Resolve Hardware and Software Issues- Sealed Non-Removable Battery
OR
Notebooks - Power Reset to Resolve Hardware and Software Issues - Removable Battery
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=====================================================================================
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Using and Troubleshooting the TouchPad (Windows 8)
HP ENVY m6-1178sa Notebook PC Drivers & Downloads
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not everything, of course, but some of the basics are covered:
HP Pavilion TouchPad not working
Good Luck!
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S431 Touchpad stopped working

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