Internal Server Error 500

[Sanity]

I have a dedicated server with ubuntu and today in the morning a client has called me that does not work for his website. The problem is that I have the error in all the pages of my clients. I tried to restart services but still with the same error. What I can do?

[kenneth]

What does the log say?

[Sanity]

I have already been able to solve it. they hacked me a wordpress and added .htaccess that made it give problems. Thank you