Krayzie - I apologize, I'd modded a few in the past and couldn't get my AR software to transfer the save to the USB drive as I had in the past. It's been about a year since I read the readme, but yes, I did. I mentioned that I was a moron for doing it that way. If I'd realized FTP was available during the process, I would have backed up the EEPROM that way. Again, moronic.
It's been unplugged since I posted this originally, as I'd just swapped it in where mine was. After I told it to restore from CD, I got the flashing red ring of death, and decided I'd killed it enough for one day.
Now having hit the forums, I know I could have used the alternate software, but it took me killing it first to direct me here to learn that. A catch-22 of sorts.
ahero4heor - I did a hotswap on *my* xbox and dropped an old 120GB drive in it, so I'm not afraid of that method. I just figured I'd need the EEPROM to get the HDD key to unlock the drive before doing anything else.
obcd and zacebac - thanks for the suggestions. If I'm still getting the RROD and krayzie's method doesn't work, I guess a $15 modchip to save a $100 Xbox is a decent plan. Suggestions on chips and places to get them?
thanks to everyone for the help. I'll try these tonight and let everyone know how it goes.