To add, the hostmonster info page on the subject was far more useful than the troubleshooting guide that the tech sent me, and in much more detail.
Two of the sites had plugin issues, one site had a theme issue. I’m not sure why I wasn’t able to discover that the FIRST time I tried renaming the theme and plugin folders, but it’s working fine now.
Thanks for the information and links guys. I got it figured it out!
oh, also, and I don’t know if this will provide some kind of clue, but it’s still loading my favicon for http://www.howtomakesushiathome.com. How would it be able to load the favicon but return a server error for the rest?