i was trying to install gingerbread on my elocity a7+ tablet and it seemed to be going fine. It said i needed to reboot to continue so i did. When i restarted it, it never started into an os. I turned on straight to a black screen, no text at all. I've tried holding all the key buttons and even unplugged the battery. Nothing works. How can I fix this? Installing a custom ROM or going back to the factory would be fine.