they can't be found in windows explorer OR disk manager. when i plug in my flash drive to one, it lights up and my computer makes the "ba-dump!" nice like it knows it got plugged in. the light on my flash drive turns on at first but turns off right away, like the computer isn't reading the drive. i tried plugging in my mp3 player, and i got the same response. it charged my player, but it didn't read it. please help. anything i missed feel free to ask.