Thanks!!!
I copied the standard/header.html from moodle.org/theme.... and now it look just fine. But how could the file be corrupted several times!? I think I unzipped and uploaded moodle about 3 times, each time with the same result (even downoladed moodle for each time). Oh well, now it's fine! Thank you everybody for your time
Installing and upgrading help
All pages shows lots of code at the top
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