USB Drive Not Recognized by Multiple computers

I have 2 Windows 7 Computers and neither one will recognize a Lexar 16gb usb flash drive, my son has a Windows 8 Computer and it won\'t recognize it either. I see the drive in disk mgmt, and, sometimes, Windows explorer, but when I click on it, in Windows Explorer, I get the message, "Please insert a disk into Removable Disk(I ". In Disk Mgmt, the device says "No Media", when I right click to go to Properties, the device status shows "This device is working properly" and, finally, when I try to update the driver, it sas the driver is up to date. I think the drive is dead (it was bought for my son for Christmas), but want someone else's opinion