That phrase from "The IT crowd", (and real life) is a common and effective response to general computer problems. I'd like to get some opinions on what the top three Moodle equivalents are. here are some suggestions.
Have you tried it with a different theme?
Have you turned on debugging to see any error messages?
Have you tried restarting your server? (Ok I ran out after two, how about have you tried upgrading from 1.9)