With the advent of WordPress version 3, my most common fixit request has been, “Help! I just see a white screen on my blog!”
I’ll share with you what I’ve found to be the most common cause, but first there’re a few things you can do to at least get back up and running again.
If you have Dashboard access, first disable ALL of your plugins. 9 times out of 10, you’ll see your site reappear.
If you still see just a white screen, the next step is to switch themes. Activate WordPress’s default theme (the twenty-ten theme, now) and check your site again.
If that didn’t fix your problem, you’ll need to start verifying core files and such, or employ the services of a WordPress professional to help you get your site back up and running.
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I had this problem when I upgraded to 3.1, and it turned out to be the coding in the theme that I was using, plus a plugin that was no longer compatible.
It took me a week to iron out the problems though, which was very frustrating.