Error 500

My host has been updated and my IPB has stopped working. I get the error below.

I have tried so many things that I don't know how to solve anymore. Has anyone gone through something similar and can help?

"An error occurred(500 Error)

We're sorry, but a temporary technical error has occurred which means we cannot display this site right now.

Connection timed out

You can try again by clicking the button below, or try again later."