Did you ever resolve?
This is the board with the external OC monitoring panel, right?! I owned this, too. I had a similar KV8 board from Soltek, as well--post codes, also. My Abit died several years ago.
The ABit's manual still exists online. According to the code, It's hanging on the onscreen logo--it says to switch to text. Here's the page describing your code: http://www.manualslib.com/manual/615/Abit-Amd-Athlon-Kv8-Pro.html?page=69#manual
If I remember correctly, that's not a serious error code--popped up often after new installs.
If it's a hard drive error--do you have the master/slave configuration jumpers correct? (Hard drive vs. Optical drive? Probably, you want the hard drive as master--optical as slave)
Is cable orientation (Pin 1--from PATA cable and at drive(s)/board) correct? Perhaps I remember now--maybe the BIOS can't get to the hard drive and OS.
Is your floppy light always illuminated (it shouldn't be)--is that cable installed correctly?
If your onboard hdd controller is dead--and, you worked with AGP over the years--you likely have a PCI card that will take its place. (If not, you may purchase that pretty easily. still.) Syba, Siig, Sabrent, StarTech, etc.
If your controller is OK, have you tried running a live i386 (32-bit) or AMD 64(64-bit) Linux disk or an old Bios upgrade/DOS floppy--to see if you get some type of OS posts? Is your proc 64-bit or 32-bit?: If I remember correctly, 754 CPUs generally were 64-bit--some were 32-bit, though (I still own one of those, too).
Did you clear your CMOS first (move the jumper for a few seconds and back)? Is the jumper correctly installed now?
Ah, the days of socket 754 (I never obtained Socket 939.....) Socket 754 still is a good value--you may obtain such a proc for about $5 on Ebay. (Used boards are a little pricey--considering.) I get the sense that 754 was the business board--939 was the gamer board.
Recently, I resurrected my old Shuttle Athlon XP board--considering its age, it holds up pretty well. Works fine with 32-bit Linux Debian distros. Dual-channel. Great OC board in its day. Currently, I have a 9800XL card in--soon, I'll put in a 3850 AGP....