hi! i just got surface pro 3 and already having some issues with the usb port. i have multiple usb flash drives and none of them can be read by the usb port. i then tried my usb powered external drive and was able to read the drive. the external drive uses more power than flash drive so i'm really confused of what going on. this is the message im getting: USB Device Not Recognized The last USB device you connected to this computer malfunctioned, and Windows does not recognized it. Recommendation: Try reconnecting the device. If Windows still does not recognize it, your device may not be working properly i've tried updating everything including the firmware updates but it didn't help. i uninstalled the usb driver then restarted but same issues. i followed the steps for regedit from microsoft's website for windows 8.1 and it still didn't help. any help will be appreciated, thanks!