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I can’t see the screen image, so I’m going to take a guess and say it’s the splash screen. Are you certain that the battery totally discharged (I assume that you can’t pull the battery)? It might be worth trying again, just to be sure. You can try to boot into recovery, usually that means holding down a series of buttons, and it differs by model, and I’m not familiar with yours. Try a combination of the power button, up/down volume, home button (if it has one), camera (if it has one). If that works you will boot up to a text menu, and one of the options will be a factory reset. It’s a last resort, but if it is the only option, it beats a bricked tablet. If it is rooted and you made a nandroid backup, you can restore that instead of a factory reset, of course.