My iphone 5 wont turn on. all it does is reset over and over when plugged in

about a month ago Apple sent me my refurbished iPhone 5 when I got mine wet. This iPhone had a charging problem from the beginning, the cord they sent me wouldn't charge it (but I already had a different one so I wasn't worried). I used mine and it was fine but it would say like 89% charged , when I knew it was about to die or 1% charge after I had charged it for like 30 minutes. This didn't do anything but aggravate me when It died at 30% , so I wasn't worried again.. but now , whenever I plug it in , all it does is reset. The apple symbol will appear for a few seconds and then the phone will go back , and two minutes later - the same thing. when I unplug it , it just goes black. It has never been dropped or gotten wet , its always had a protective case on too.. I got online and saw that some people could go on iTunes and restore it & fix the problem.. but iTunes doesn't recognize my serial number and keeps saying "unknown error" when I try to restore and update it. I don't know what to do  ): please help!

Yes, if you know you have a good Backup and your computer has a current iTunes then at this point you might as well Restore it to Factory Settings and see if it works well.  You can take your iPhone 5 and hold the Home button while plugging in the lightning cable to it.  This should result in the phone coming up with a graphic on the screen that indicates you should connect it to your Computer with iTunes and Restore.  You can click on Restore and when it asks say Restore as a New Phone (Not from Backup).  After it is full Restored and you go through the normal very few setup questions / answers you can go back and Restore from your Backup. 

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