Windows 7: USB device not recognized, only at 4/12 ports

Hello

I have Kingston 2GB DataTraveler (DT) and windows 7 RTM 64bit does not recognize it when pluged into 2 front usb ports or 2 top back usb ports. Other 6 lower back ports work. I have Gigabyte GA-EP35-DS3 mobo. This mobo has 8 usb on the back and 2 usb headers. One header is used for Codegen 7in1 cardreader+1usb port, other is used for 2 front panel usb ports.



Few things ive noticed:
1) my old apacer mp3 player works on all usb ports.
2) most of new higher capacity usb's are not recognized in those malfuncioning ports
3) if i plug DT into Codegen's USB port, DT is then recognized on all ports

I've read this thread, tried instaling new Intel's Infs, tried removing all usb devices exept Codegen's. No effect. Any suggestions for my case?

Similar problem: see my thread

http://www.sevenforums.com/hardware-devices/157142-usb-devices-not-recognized-selectively.html

Did you recently install any new hardware such as a PSU? Or did u do a recent windows update?


If anyone comes up with solution let me know.