A completely blank page with no error message almost always means a PHP fatal error with error display switched off.
1. Turn on error reporting
Edit wp-config.php and change or add:
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);Reload the page, then read wp-content/debug.log in File Manager. It names the exact file and line causing the crash.
2. Disable plugins
In File Manager rename wp-content/plugins to plugins-off. If the site returns, rename it back and then rename individual plugin folders one at a time until you find the culprit.
3. Switch to a default theme
Rename your active theme's folder in wp-content/themes/. WordPress falls back to a default theme such as Twenty Twenty-Four. If that fixes it, the problem is in your theme.
4. Raise the memory limit
Memory exhaustion frequently shows as a white screen. Set memory_limit to 256M in MultiPHP INI Editor.
5. Check for a broken edit
If it started right after you edited a file, a single missing brace or semicolon is the likely cause. Restore that file from backup.
Remember to set WP_DEBUG back to false and delete debug.log when finished.
