What this problem looks like
A 500 error means the web server encountered an unexpected condition. On WordPress sites the cause is usually a bad .htaccess rule, PHP fatal error, memory limit, or incompatible plugin after an update.
Unlike a white screen, some hosts show a generic 500 page. You still need server logs to find the real message. Start with .htaccess and logs before reinstalling WordPress.
Step 1: Find the real error in server logs
Log into hosting and open Error Log or Raw Access. Search for entries at the time you saw the 500. Look for PHP Fatal error, mod_security block, or AH01071 lines on Apache.
- cPanel: Metrics → Errors or File Manager → error_log in site root.
- Plesk: Logs for the domain.
- Managed WordPress hosts: Application or PHP logs in the dashboard.
Step 2: Test with a default .htaccess
Corrupt or plugin-added rewrite rules are a frequent cause. Rename .htaccess to .htaccess.old via FTP. If the site loads, the problem is in rewrite rules.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPressStep 3: Enable debug mode in wp-config.php
If logs point at PHP, enable WordPress debug logging:
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );Step 4: Deactivate plugins and switch theme
Rename wp-content/plugins to plugins.disabled. If the 500 clears, move folders back one at a time. If not, rename the active theme folder in wp-content/themes/ and confirm a default theme exists.
Step 5: Raise PHP limits in hosting
500 errors often follow memory exhausted or maximum execution time messages. In hosting PHP settings, raise memory_limit and max_execution_time. You can also set WordPress memory in wp-config.php:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );When to stop DIY and hire help
If the 500 persists after .htaccess reset and full plugin isolation, the issue may be server configuration or corrupted core files. BugShield fixes 500 errors at a confirmed price without hourly billing surprises.