To both of you, thanks for the help but LAUBi, it happened to me on multiple computer so it couldn't have been your suggestion. I can log into my cpanel through that link though, so I'm going to undo any changes I made and try again. Thanks!
edit:
Another odd thing I just noticed, is that while the page says there is a report in the server's error log, I can't find an error at all. It also doesn't say I have any visitors while I visited it several times today to see if it fixed myself. I'm still puzzling over this.
New edit:
The front page extensions aren't the problem. I uninstalled them to no avail.