BIP KB:
How To Disable Plugins In Wordpress

If you are unable to login to WordPress and are seeing an error similar to

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*Warning*: Cannot modify header information - headers already sent by (output started at /home/example/public_html/wp-content/plugins/zopim-live-chat/accountconfig.php:20) in */home/example/public_html/wp-includes/pluggable.php* online *1121*

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You may have a plugin that is preventing WordPress from functioning correctly.

It possible to disable a WordPress plugin by logging into phpmyadmin, selecting your WordPress table, which is usually your username followed by _wp1.

For example, if your username was bob, your WordPress name might be bob_wp1

Please Note: Before going any further you should back up your database before you try to edit it.

Once you've found your table, run the following query against your table.

UPDATE wp_options SET option_value = 'a:0:{}' WHERE option_name = 'active_plugins';

This will disable all active plugins, but will not delete or modify them.

You can also run a query through the command line.

Log in through SSH and execute the following commands.

root@example# mysql 
Mysql> UPDATE wp_options SET option_value = 'a:0:{}' WHERE option_name = 'active_plugins';