Thanks for the suggestion!
I’ve tried doing so. Instead of a blank screen, I’m then getting a 500 error (for both wp-login.php and index.php):
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.