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In
wp-config.php, enable debugging: -
Check the debug log:
wp-content/debug.log -
Review cPanel > Metrics > Errors log.
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Deactivate plugins via FTP:
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Rename
/wp-content/pluginstoplugins-disabled
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Revert to default theme via phpMyAdmin:
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Update
templateandstylesheetinwp_options
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Never debug on a live site without restricting access (via IP or .htaccess).