The reason it is going to the red X. There are 2 problems first you do need the charger that came with your Tab 2 or any that put out 5v 2A. If you are using the 2A charger and still have the red X then you need to replace the cable that you are using to charge your Tab 2. I did this and now it charges with the Tablet turned on and NO red X. I figure if you at some point kink the cable or roll a chair over it making a flat spot it might of broke or messed up one or a few of the many wires inside the usb cable. So buy a few extra cables just in case. this of course is just my 2 cents. I had the problem of the red X and buying a new cable worked in my case. I tried the power down thing pulling the cable in and out fast. Nothing worked until I got a new cable.