USB ports are all powered. In the system that i upgraded I unplugged my originally HDD that had Windows Vista 64bt on it. When this drive was originally installed the USB flash drives worked fine. Once i unplugged this hard drive and installed the SSD and Windows 7 the flash drive was no longer recognized. All Windows 7 updates have been done and all motherboard drivers are up to date.
The other rig had Windows XP and a HDD in it and the USB flash drive worked fine in that as well.
The only common denominator in both systems that i changed was swapping out the HDD for SSD and install fresh copies of Windows 7.
I have tried all the USB ports on front and back of both systems. Even unplugging mouse and keyboard ones that i know work. Still does not register.