My Samsung Galaxy S3 seems like it's not charging. I've the charger it came with, it says it's charging but it slowly goes down. I used two other chargers and it's still doing the same thing. Before it stopped working, I could plug my usb from my phone into my computer and could manage files from my computer, now when I plug my phone into my computer nothing pops up like it use to but it says it's still charging but it's not. The port looks fine from what I see so I really have no idea what's going on.