How to get rid of the white screen

is there anyone who can help me?
problem is the white screen at the startup and i have no cd or dvd with op system.
someone has changeng in my imac settings of the hdd.

If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitirion & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.

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