Hi, I discovered that the versions of PHP and MySQL were ancient! I contacted my ISP (I’ve had a webpage on there for something like 20 years), and they moved me to a newer server, with newer versions of everything, and with WordPress installed already. So I guess my problem is solved now.
So, I suspect my problem was due to the vintage PHP version.
Thanks for your reply – I discovered that php had display_errors set to off, so I changed it to on.
So now I am getting this error:
Parse error: syntax error, unexpected T_STRING in /var/www/html/wordpress/wp-includes/load.php on line 1095
Just as a test, I tried installing version 4.9.3, and am getting the same error.