Galaxy Tab Pro 8.4 bricked?

[AC Question]

I can't get the tablet to boot, and it won't turn on, and windows won't recognize it. If unplug the battery, it will come on, and show the battery icon, but it appears frozen. I successfully flashed a 6.0 nightly, and it loaded fine. I then flashed a SuperSU zip, and now it won't boot. If I hit the power button for a few seconds, it turns off, and won't turn back on unless I unplug and plug back in the battery. Am I screwed?