there can be multiple reason. try to disable all your plugin, then see if page working or not. if works activate plugin one by one and check site each time after each plugin activate. so you can find which plugin making the problem. check .htaccess. there can be server memory issue, in case if your wordpress a lot of posts like 10K+ without cache plugin such site will make always problem.
As said, could be a plugin. This also happens if you change something in the code editor. It happens to me sometimes. Then even the admin page is blank because it doesn't load.
Back up your posts and reinstall. Try another theme.
yes, edit php.ini
display_errors = 1
or sometimes the errors are produced in a file called error.log inside your "default folder" you can trace from the files what was missing.
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