Startup disk is full no matter i erase many files

Question

No matter I have erase programs, mails, files and pictures, my startup disk is saying its full. Now my computer starts but the displays starys on grey only and coul not do nothing, please help!

Answer 1

You need to use Lion Recovery and TimeMachine and repair your drive with Disk Utility - boot with Option key and select the "Recovery" volume and go into DU to repair the drive.
TimeMachine will keep a local copy of all the files that need to be backed up, and you do want a backup system.
http://pondini.org/TM/14.html
http://pondini.org/TM/Home.html
General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
Identifying resource hogs and other tips: Using Activity Monitor to read System Memory and determine how much RAM is being used
Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?
To identify potential hardware problems: Apple Hardware Test
General Mac maintenance: Tips to keep your Mac in top form
Using Cloning as a Backup Strategy
Carbon Copy Cloner 3.4.1
OS X Lion Install to Different Drive
Lion Recovry & TimeMachine
http://www.apple.com/support/lion/installrecovery/
http://www.apple.com/support/lion/
https://support.apple.com/kb/PH4542
https://support.apple.com/kb/PH4351
https://support.apple.com/kb/HT1427
https://support.apple.com/kb/HT3275
https://support.apple.com/kb/HT4878
https://www.apple.com/support/timemachine/
OS X Lion v10.7.2 and later: Starting from the recovery partition of a Time Machine backup drive
Hold down the Option key at startup to boot into the startup manager. Select the recovery partition of the Time Machine backup to start from. Once booted, you will have all of the functionality of the OS X Lion recovery partition.
https://www.apple.com/osx/recovery/
Lion Recovery Mode https://support.apple.com/kb/HT4718
https://support.apple.com/kb/PH5848