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hey,
 i've been using arduino for over a month now.. it had been working perfectly except that suddenly now im unable to upload any code to the arduino nor can i use the serial monitor to get the outputs from the arduino via serial communication . The strange part is that i didnt try doing anything either , it just randomly stopped.. although i do have some code on it which turns on an LED based on motion sensors and that continues to work with no issues , the only problem is that im unable to upload any new code to it nor monitor its serial output.
   Any help would be appreciated..
Thanks..
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Which Arduino board?  What operating system?  See: http://www.arduino.cc/en/Guide/Troubleshooting for suggestions, which may be relevant even if the board was working previously.
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its the arduino UNO.. i tried it on windows and ubuntu but no response...i did read the troubleshooting guide.. im a bit scared to RESET cause there is some code in it that already works i dont want that to go away too ..thanks ..
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a small update.. im now somehow able to give input to the arduino via a serial connection..but still not able to get any output from the arduino and not able to upload code to the arduino..Really strange..
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im still having the same issue.. any help would be appreciated..thanks smiley
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What OS are you working in?  I just recently had some problems myself with both Vista and 7 where the board would suddenly go unrecognized, refuse to upload properly, etc.  Turned out all I needed to do was run the IDE as Administrator, and it works perfectly and hasn't given me trouble since.
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i've tried on both ubuntu and windows.. dont think its an OS issue..also cause i have a serial connection with the arduino and im able to input via serial connection but dont get any output from the serial connection..Thanks for the reply BTW
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