your computer died while sbfing?
ewww that sux
the screen your looking at is called the bootloader screen, what you can try and see if this works, is boot to the stock recovery.
hold home+power, once it powers on release power, when you see the exclamation either hit the search key, or your 2 vol rocker keys, wipe data and cache, remove the battery.
but the battery back in enter into bootloader mode, camer+vol down+power til you see a quick flash
then try the 2.3.340 full system sbf one more time.
you may not be able to boot into stock recovery, but it never hurts to try