USB isnt being recognised! HELP!!!

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http://forum.xda-developers.com – My device doesnt appear on my PC when I connect it and niether does my phone pop up USB debugging menu which it once used. I have no clue what happened to my poor phone. Its running 4.2.2 cm. And it doesnt get recognised by odin either in the download mode. what may have gone wrong? :( (HowTos)