Hello there. I own a Tab3 7.0, model SM-T210R, 8GB, Android 4.1.2. Yesterday I tried using it and it didn't turn on. Dead battery. So I plugged in the charger to re-charge the battery. But, I noticed it wasn't charging. Since I have some other hundred of other chargers (and an extra original Samsung Tab3) and cables, I tried the obvious. No success with any of them. I tried the charger on my other Tab3 and it worked OK. I tried the charger and cables on my phone, and it was OK. So, I went to the internet for some information and found only people talking about charger and cables and restoring the factory settings. Nothing really useful. I found one thread that said to use the computer's USB port. I am an electrical engineer and that answer, for me, was the most outminded one. Theoretically, it really doesn't matter if you are using a wall charger or a USB port. The current output of a USB is limited to 500mA (as with a wall charger). So, if the battery of the tab (or any other device) is really discharged, it couldn't even draw more current, causing the USB port to shutdown. A low current charger would only charge the battery more slowly. Saying that, in my personal, technical, wise, all-of-the-above experience, that would be my last choice of power supply. I don't believe in witches, but they do exist; and, since nothing else worked and it was late at night, I plugged the Tab to the computer's USB port and let it lie there overnight. What harm could happen??? For my surprise (and to remind me that I know less each day), the tab display showed the battery icon half full. At this point I could turn on the device. I also plugged in the wall charger, but the battery still wasn't charging, and no indication of a charger being plugged. I plugged back the cable attached to the computer's USB port, but no charge indication. Since I had about 22% of battery, I made a "factory reset", going into the boot menu (pressing UP volume button, main button and power button, releasing the power button when the Samsung logo appeared). Still the same thing. I also noticed that when I plug in the USB cable, the computer doesn't recognize the device. On other thing that I noticed is that, when the device is off and charger is plugged, you can see the display trying to light on but turns off after a second or so. It repeats this same situation with all the other types of chargers. Right now I am discharging the device to see if I can repeat the procedure I made last night. Making a long story short: any suggestions? I will keep you guys posted about my progress.