I know you probably already did this but I googled it and found one or 2 things.
http://www.computerhope.com/issues/ch001171.htm
http://www.google.com/search?hl=en&source=hp&q=flash+drive+not+connecting&gbv=2&oq=flash+drive+not+connecting&gs_l=heirloom-hp.3..0j0i30l3j0i5i30l2j0i22.1660.12849.0.13078.26.22.0.4.4.0.167.2412.1j20.21.0...0.0...1c.1.Esz3S8rMYaY
http://www.computerhope.com/issues/ch001171.htm
http://www.google.com/search?hl=en&source=hp&q=flash+drive+not+connecting&gbv=2&oq=flash+drive+not+connecting&gs_l=heirloom-hp.3..0j0i30l3j0i5i30l2j0i22.1660.12849.0.13078.26.22.0.4.4.0.167.2412.1j20.21.0...0.0...1c.1.Esz3S8rMYaY