The Internal Server Error (500 error) in WordPress is often due to plugin or theme conflicts, a corrupted .htaccess file, or server memory limits. Here’s how to troubleshoot it.

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Step 1: Check and Rename the .htaccess File

1. Access cPanel or FTP: Log into your hosting account, go to File Manager.
2. Rename .htaccess: In the public_html directory, locate .htaccess and rename it to .htaccess_old.
3. Regenerate: If your site loads, go to Dashboard > Settings > Permalinks in WordPress, and click Save Changes to generate a new .htaccess file.

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Step 2: Increase PHP Memory Limit

1. Edit wp-config.php: Open the wp-config.php file in the root directory.
2. Add Memory Code: Insert define('WP_MEMORY_LIMIT', '256M'); and save the file.

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Step 3: Deactivate Plugins

1. Rename plugins Folder: Go to wp-content, rename plugins to plugins_old to deactivate all plugins.
2. Reactivate Plugins Individually: Rename the folder back to plugins and reactivate plugins one by one to identify the problematic one.

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Step 4: Switch to a Default Theme

1. Rename Active Theme Folder: Go to wp-content/themes and rename your active theme folder.
2. Check Site: If it loads, the theme may be the issue.

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Step 5: Enable Debugging

1. Edit wp-config.php: Add the following code to enable debugging:

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

1. Check debug.log: Review any errors in the wp-content/debug.log file.

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This should guide you through the key steps to resolve the Internal Server Error in WordPress efficiently. Let me know if you’d like images added to specific steps!