HT204448: About the OS X Mavericks v10.9.2 Update
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Q: My usb port does not work after updating maverick 10.9.2
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Apr 12, 2014 6:59 AMby jeremy_v,Hi AK Snowball,
Thanks for visiting Apple Support Communities.
If the USB port(s) on your Mac are not responding, first reset your system's NVRAM and SMC using the steps in these two articles:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
All the best,
Jeremy
