when I am logged in, it shows me the page but without any special, and when I am not logged in, it simply shows a completely blank page.
What could be the problem and how to solve it? check the logs and nothing related appears.

DISCLAIMER:
You should not modify core files .. if you would like to donate a cup of coffee I will write it in a modification for you.
https://www.youtube.com/watch?v=zXIxDoCRc84
It's very rare that there are no errors written to any log so try and find the right one:
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Then - please - edit your 1st post and add [SOLVED] in front of the subject.
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