My MacBook Pro Won't Start-The Startup disk is full and I get a white screen

When I turn it on the log in screen appears and also a message saying "Startup disk full,please delete some files" , so I log in and it just takes me to a white screen,I've tried going to the disk utility by doing Command+R when turing it on ,and I repaired Macintish HD and after that it said "Macintish HD volume is OK".Thanks for the help

1. Start up in Safe Mode.
    http://support.apple.com/kb/PH11212
2. Empty Trash.
    http://support.apple.com/kb/PH10677
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. 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
5. Re-index Macintosh HD
   System Preferences > Spotlight > Privacy
   http://support.apple.com/kb/ht2409

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        http://support.apple.com/kb/HT4946?viewlocale=en_US&locale=en_US
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    Go step by step and test.
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        http://support.apple.com/kb/PH11212
    2. Empty Trash.
       http://support.apple.com/kb/PH13806
    3. Disk space / Time Machine ?/ Local Snapshots
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    4. Delete old iOS Devices Backup.
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        http://support.apple.com/kb/HT4946?viewlocale=en_US&locale=en_US
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        System Preferences > Spotlight > Privacy
        http://support.apple.com/kb/ht2409

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    If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.  
    Step 10
    Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
    Step 11
    Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
    Step 12
    This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
    Step 13
    If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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