Synaptics error "no touchpad found" at startup on HP laptop

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http://askubuntu.com – I know there are a lot of topics on the synaptics touchpad not working, but I can't seem to find the answer to my problem anywhere. Please forgive me if I missed it. Here is what happened. After using the "ambient light" F11 key on my HP laptop (Compaq nc8430), the touchpad was disabled and I couldn't get it to work. Then I found this thread : "Synaptic touchpad on laptop not working". And Salem's answer totally solved my problem, both for the session fix and for the permanent fix. But since then, after each reboot I get the same error pop-up, with the following content: No touchpad (HowTos)