No Database Connection Localhost (Mac / Xampp)

Hey,

I have been using wordpress for some weeks now on a windows computer. I recently bought a macbook pro so, as you might expect, i need to import my site to my mac.
(it is not a problem to start over since i was not that far in creating the website)

The only thing is that whenever i try to acces localhost/wordpress it gives me this error message: ” Error Establishing a database connection”

I have messed around a lot with files and settings to make it work, which it did one time but then it gave me another error, so now i have deleted the edited wordpress file in /htdocs and hoping that anyone here could help me.

Coen