Iphone 4s fails to restart after installing ios 5.1 & then restoring from backup ?

I have restored My Iphone 4s to Os 5.1 Yesterday ... every thing went fine ..... at the time of restoring it from my previous backup ........ iphone fails to restart ..... it is in continous loop of apple logo and busy icon thereafter .. can anybody help ????

In that case, if everything else has failed, you can restore your iPhone by putting it in to DFU mode.
Follow the steps precisely.
1) Connect your phone to computer. Open iTunes (if it doesn't open automatically).
2) Turn your phone off. Turn off the device by holding down the sleep/power button in the top right corner and Home button at the same time. A red slider will appear. Slide it to the right to turn off the device. Alternatively, keep holding both buttons even after the slider appears and the device will turn off. Let go of the buttons when the device powers down.
3) Put iPhone into DFU mode. Hold down both the top (sleep/wake) and home buttons for exactly 10 seconds, then release the top (sleep/wake) button but keep holding the home button until iTunes displays a message stating that a phone in recovery mode has been discovered. Let go of the Home button.
4) Device screen is Black. If your device's screen is black, you are in DFU Mode. It may appear that the device is turned off, but it's not. If your phone displays anything, you are not in DFU mode.
5) Restore. Press the restore button and allow the phone to complete the restoration data. After it is done, select setup as a new phone. (Preferable)
Restore your backup (optional). Next, you can restore the phone again in the normal fashion (not DFU mode) using the most recent backup rather than setting up as a new phone. However, this may cause the original problem to return in some cases. If the problem returns, follow steps 1-5 again and setup as new. Do not restore from your backup afterwards.

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Honsetly I do not know if they will charge you, however apple products usually have a one year warranty, such as your charging cable, might. But if you tried to use another charging cable then you will want to make an appointment with Apple. good luck

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If anyone else is looking for a solution to this same problem, I was able to get it working looking through several older discussions.
The solution was to use the password that I had on my iTunes account the very first time I set up the iPhone about a year ago. I changed my iTunes password about 10 months ago; but apparently, the backups continue to use the password that existed when the phone was first set up.
A couple of troubling things with this are that 1) I didn't apply a password when I did the backup this afternoon so I don't understand why it was required when I did the restore a few hours later. and 2) it makes zero sense why iTunes would not be smart enough to use the current accout password when requiring the password to restore from a backup made with no password.
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Just bought new Mac pro when I sync my iPhone 4 i lost all my contacts on the phone .tried restoring from backup no luck .is there any way I can retrieve my contacts

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See if these Articles help resolve your issue,
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http://support.apple.com/kb/ts2529
http://support.apple.com/kb/HT4946

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If I want to restore my 'new' (refurbished) iPod from a back up of my old one, I need to get iOS5.1 on this one.
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right?
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Pleaaasee hellppp!

I don't have my old iPod, just the refurbished one, but I backed up my previous one beforehand when it was connected to my computer.
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