suppose your pen drive is detect on your system it will automaticaly display your pen drive . it is not display your pendrive then some usb drivers are misssing just check it.
Since this is a new system a usb drive should be detected properly as the usb drivers should be native to the OS. What Operating System is this? Vista or XP? Have you called the manufacturer for support yet? I suggest you do so since a new system is under warranty.
When they ask you to reinstall the OS, that is the furthest that support can take it. If you have the same problem after a fresh install, you will have to send the laptop in for repairs. But it doesn’t sound like it is a problem with the laptop. Try your usb drive on another computer and see what that does. Reformat the drive on the other computer if you can access it, then try it on your computer again.
The best thing you have to do is to plug in the USB device to another computer which runs a different operating system. There might be a conflict with drivers installed into your computer system and you have to perform some troubleshooting to determine the problem.