My iphone 4 is no more found in any computers during the USB linking

My iphone 4 is no more found in any computers during the USB linking.......how can I do? I already followed the guide on the Apple site but it is not working. Thanks!

Ok. What you should do:
Step One
Open iTunes and connect the iPhone to your Mac.
Step Two
Press and hold the Home button and the Sleep/Wake button at the same time.
Step Three
After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
Now your iPhone is in DFU mode. Now connect to iTunes with the cable. And click "Restore" in iTunes.
Hope this solved your question.

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