Touch Pad on 6550b Just stopped working...

I have an HP Probook 6550b and the touch pad just all of a sudden stopped working. I've reinstalled the driver but still not working. It shows up in the device manager but not in the Synaptics list of devices. I've even done a system restore thinking maybe an update messed it up but still nothing. Anyone? 

have a similar problem with 6550b. i can move the cursor and use the right-click button. however, left-click button and tapping on the touchpad don't work. same thing in BIOS and in windows (after reinstall)
it happened after a restart and at the same time windows crashed to the point no system restore worked. any comments from HP? as usual, my warranty ran out 3 months ago.

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