I recently updated the bios of my Abit KT7A to latest release (7n). When I did this, I can no longer access the bios information because when I hit the 'delete' key all I end up with is a black screen with a blue line along the bottom (1/2" high blue line). It just sits there and does nothing. I've tried flashing back to the original version (ww) but with no luck.

What can I do to get my bios back?

If flashing it doesn't bring it back there's really only a couple of options (assuming you've tried a CMOS reset):

New mobo
Hot-flash (requires a duplicate mobo and some fiddling)
New BIOS chip

Clearly option 3 is a good thing to try if you've exhausted the standard flashing/reset options. I'd contact Abit, they're meant to be pretty good with BIOS chips ($10-20 I think).
http://www.abit.com.tw/page/en/contact/index.php
http://bios-repair.co.uk/ref/mabitcr.htm

I can't vouch for that second site, just what came up on a google search.

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