Error 500 after update

As a new admin on our site ( I logged in for the first time and was advised by the site that there was an update to apply. I backed up the database (as suggested) and applied the update, at which point all I get back from the site is Http error 500. Your update appears to have broken the server - how do I fix it now?

View Replies:
Gondwana replied on at Permalink Reply
I'd be checking php versions.

Server logs may have more info on what caused the 500.

I hope you also backed up the concrete5 files; they're as much a part of the installation as the database.
ConcreteOwl replied on at Permalink Reply
Do you know which version of concrete5 your site is running?
sdbs2 replied on at Permalink Reply
We've got it back up now. I think it hadn't been updated for a long time, so was using an old release of PHP. It's currently on Concrete