My MacBook Pro does not boot beyond the login screen. I have a full hard drive. Help!

I Have a 15" MacBook Pro with Retina display. I tried to move files off the hard drive when I got a message warning me that the drive was almost full. I shut down, connected an external hard drive to move some files, but on reboot, the screen went blank (white) after typing in my login details. what else can I try to correct this problem?

Go step by step and test.
1. Start up in Safe Mode.
    http://support.apple.com/kb/PH11212
2. Empty Trash.
    http://support.apple.com/kb/PH10677
   http://support.apple.com/kb/PH13806
3. Delete "Recovered Messages", if any.
    Hold the option key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the dropdown.
    Library > Mail > V2 > Mailboxes
    Delete "Recovered Messages", if any.
    Empty Trash. Restart.
4. Repair Disk and Permissions
    Steps 1 through 7
    http://support.apple.com/kb/PH5836
5. Disk space / Time Machine ?/ Local Snapshots
  Local backups
   http://support.apple.com/kb/ht4878
6. Delete old iOS Devices Backup.
    iTunes > Preferences > Devices
    Highlight the old Backups , press “Delete Backup” and then “OK”.
    http://support.apple.com/kb/HT4946?viewlocale=en_US&locale=en_US
7. Re-index Macintosh HD.
   System Preferences > Spotlight > Privacy
   http://support.apple.com/kb/ht2409

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