Question : TOUCHPAD and 2 out of 3 USB ports stopped working after opening laptop to clean dust!

I recently opened my Toshiba M40 laptop in order to clean some dust off the CPU fan. I though I was being very careful, however once I put everything back together my touchpad stopped working and so did two of my side USB ports.  Before I open in back up, can anyone suggest what might have happened?

Answer : TOUCHPAD and 2 out of 3 USB ports stopped working after opening laptop to clean dust!

This guide for the 4010 may help also: http://tech.irisvista.com/laptops/Toshiba4010/portege4010_1.htm
I agree, probably a cable or two disconnected.
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