Charging problem

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http://forum.xda-developers.com – Hi i have a problem with my s+ . When i plug the wall charger the phone doesnt charge , but when i plug in the usb cable from the computer the phone charges. I found out that if i turn the phone off and plug in the charger , the phone wakes up but still doesnt charge. I tried the charger on another phone and it works . What should be the problem ? can anyone help pls . I have gingerbread 2.3.6 (HowTos)