Changed theme and now can't get into dashboard!

Have you tried accessing the dashboard by adding /wp-admin/ to the end (for example, yourdomain.com/wp-admin/) yet?

You can switch back to the default theme by re-naming your twentyeleven theme folder to your new theme.

For example, if your new theme is Raccoon, you would rename twentyeleven to Raccoon.

But I don’t think this would solve the problem, though. I’m thinking that this problem occurs because your new theme somehow use a plugin (or plugins) that exceeds the php access limit set by your web hosting service.

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Alternatively, try open your Notepad or any text editor you like, and enter this:

php_flag
register_globals off
register_globals = 0
memory_limit = 64M

Save it as php.ini and upload that file to /wp-admin/ directory. Then try access your dashboard again.

If success, remove that theme and its plugins. Then remove that new php.ini.

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Also, as another alternative, you can manually deactivate all your plugins. THat might help solve the issue, too. Instruction here: http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F

Meant to type it as php_flag register_globals off, without the break.
Oh well…. 😛

And I have no other idea, sorry. I thought it was due to a plugin going over the limits set by your web hosting service provider, which manually disabling all plugins should have fixed it.

But if it’s not that, then I don’t know; it could be anything, even errors in your theme’s php files.

Maybe another person will a better idea; otherwise, you’d have to contact your host’s support.