Re: All Installed Applications Give 500 Internal Server Error
Anytime you encounter the 500 error you can review the logs to get more detailed information about what is happening on the server. Typically the error logs will point to a configuration change that needs to be made or a more serious error which could indicate syntax problems. Whichever ends up being the case error logs will definitively tell you the problem.
If you are dealing with wordpress this link may be helpful to enable debug mode