Lexar flash drive won't show up on Macbook Air?

I've been using my Lexar Twist turn flash drive on my Macbook Air for a while now and it has been working perfectly. The last time I've used it without trouble was around May - June. Just recently I plugged my flash drive in and it didn't pop up... as if nothing was inserted. I've plugged it into my PC as well and it worked fine. I've tried checking the disk utility but it didn't show up in there either. Help.
My Macbook Air is an OS X Mountain Lion 10.8.5 if that helps...

Do a backup.
Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J.  When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder.  Select Library. Then go to Preferences/com.apple.desktop.plist and com.apple.finder.plist.  Move the .plists to your desktop.
Re-launch Finder by restarting and test. If it works okay, delete the plists from the desktop.
If the same, return the .plists to where you got it  from, overwriting the newer one.
Thanks to leonie for some information contained in this. 

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