Sorry, it's now probably fully bricked if it won't power-up. I'm having a little difficulty following what you did exactly however it's no longer of any importance as the device can't be recovered if it won't start. I guess you mean that you tried loading hybrid fw and then successfully flashed it back to full 0827 original condition but then flashed full 0943 firmware. A full flash remaps the regions and loads the 0943 boot.bin as well as the 0943 fw.

You could try opening it up and disconnecting the battery for several hours or overnight to completely drain it of all power then see if it'll power on. If it can power to the logo screen it may be recoverable.