No panic. I t happen to me lot of times ending up with a BLACK OR BLUE SCREEN
Just search for this tool below
Eaglebox HD Database reset tool
If your database get corrupted, resulting in a black screen and the inability to reflash by menu or by normal rom.bin - load this file.
It can not be used as a patch because it will clear everything from your database on every reboot.
Having loaded this rom.bin, flash a full patch as normal.
In another words
Load this rom in a USB, switch your box and boot up from USB stick, it will fix it, then just remove USB before you bootup and restart, then put the latest firmware back to your box, you are done
Hope it helps