No Space on Harddrive - New harddrive

Hi,

I just got my macbook pro back from Apple Care two days ago, the harddrive was replaced, as the macbook pro was running extremely slow.

Today I noticed my Finder had no results in it, also I noticed I couldn't find Google Chrome or other applications, so I tired to reinstall Google Chrome and I got the error no mountable file systems - Also got the error not enough space on the harddrive.

Should I be concerned? - Just to note there's also a flashing globe on the screen when I restart the macbook pro, and 30 secs later the normall login screen appears.