First off please dont use caps its considered yelling and it is rude.
What Operateing System you using?
It just might be your computer doesnt have the drivers on it for that device. Plug in the device and do a windows update for it to find the correct drivers for it.
I realize CAPS are rude (I have been on the Internet since it's inception).......... but it also emphasises what I am saying!!
My OTHER flashdrives work perfectly and THIS one also previously did........... ??