It means that you should probably be backing up the data on your system ASAP, because the drive is starting to go south. You should also be looking for deals on a new drive.
While the computer is trying to boot up it says, "Pri Master Hard Disk: S.M.A.R.T. Staus BAD, Backup and Replace <F1> for setup <F2> to Continue." Does that mean the HDD is toasted? Any ideas?