Touch pad nolonger working

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http://askubuntu.com – I'm running 12.07 on an acer aspire and have had no problems, until I disabled the touchpad using the Fn and F7 keys. This disabled the touchpad fine. But when I went to turn it back on I got the enabled icon appear but the pad didn't work. The computer has been rebooted since this happened but this has made no difference. It is enabled in the settings, usb mouse works fine. (HowTos)