How do I fix my WooCommerce cart page when it loads a blank white screen?

A blank white screen on the WooCommerce cart page is typically caused by a PHP memory limit exhaustion, a fatal theme layout conflict, or a broken database query triggered by an outdated shipping or tax calculation plugin.

“Nine times out of ten, this is a memory limit getting maxed out, a theme conflict, or an old shipping or tax plugin choking on a bad database query. I’ll find which one it is and get your cart page back within a day, for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions