I have changed some passwords on my website. This is all I did. And now my website is down. I don't know why changing passwords would make everything go blank. I'm a bit confused. I have an unmanaged VPS and I'm using cPanel. Any help is appreciated, thank you.
Try to check the error_log file for errors. It is located within the public folder of your site (usually it is public_html). Coding errors on your website are most likely causing the blank pages.