on a fresh install, I have to run yarn build after creating the example-cms project or the blank white screen pops up.
Also, make sure your node is v14+.
Furthermore, this may be related to a plugin problem; do you have any plugins installed? I am leaning to strapi-stripe.
I have had 2 of 2 strapi projects give me this blank page after setting up everything.
Is there a way to backup our content-types?