Internal server errors are often caused by plugin or theme function conflicts, so if you have access to your admin panel, try deactivating all plugins. If you don't have access to your admin panel, try manually resetting your plugins. If that resolves the issue, reactivate each one individually until you find the cause.
If that does not resolve the issue, access your server via FTP or SFTP, navigate to
/wp-content/themes/ and rename the directory of your currently active theme. This will force the Default theme (WordPress 1.5 - 2.9.2) or the Twenty Ten theme (WordPress 3.0 and higher) to activate and hopefully rule-out a theme-specific issue.
If that does not resolve the issue, it's possible that a
.htaccess rule could be the source of the problem. To check for this, access your server via FTP or SFTP and rename the
.htaccess file. If you can't find a
.htaccess file, make sure that you have set your FTP or SFTP client to view invisible files.
If you weren’t able to resolve the issue by either resetting your plugins and theme or renaming your .htaccess file, we may be able to help, but we'll need a more detailed error message. Internal server errors are usually described in more detail in the server error log. If you have access to your server error log, generate the error again, note the date and time, then immediately check your server error log for any errors that occurred during that time period. If you don’t have access to your server error log, ask your hosting provider to look for you.