500 internal server error phpmyadmin. How to fix?

Question

PHP

Actually the question is in the title. I will add. There are no errors. Installed from ispmanager. There was an error before this open_basedir, now there is none. But the error did not disappear, still 500.

Answer 1

Actually, I will close the topic, I decided in this way.
1) Completely removed php from the machine, removed all ispmanager packages related to php and webserver
2) Removed phpmyadmin
3) Reinstalled webserver and added php5.6
4) Installed phpmuadmin
Thanks to prostovlad for help

Answer 2

A 500 Internal Server Error response code indicates that the server encountered an unexpected condition that prevented it from fulfilling the request.

You can look at error.log, there will be details. Or enable error output directly in the browser.