|Sometimes, USB 3.0 will be blue rather than the standard black or white. I have even seen them in green (very rarely).|
Check out this article for an example.
Control Panel > System and Security > System > Device Manager
This should list everything such as USB ports, and should tell you what type. Although it won't tell you which ones are 3.0, it will tell you how many (if any).
message edited by NT56erbx