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unhook all usb devices, wouldn't hurt to visually inspect the ports for damage. Being you have a AsRock I am assuming this is a custom built PC and the case maybe low-end? If the case's frontside usb are connected i have seen several with the contact strips pushed together because the port is coming apart.
If it all looks ok with nothing else plugged in a usb, insert the flash drive. If it still doesnt pick up try unhooking the frontside ports.
If you still have the issue go to the device manager and uninstall the enhanced usb controllers reboot and try again after the device reinstalls. If you get the usb ports to work again, as you are connecting each item back, go one at a time to check and see which device caused the port to hang-up.
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