How can i get rid of a blue screen background on my MacBook Pro

how can i get rid of a blue screen background on my MacBook Pro

Hi Heidi,
Do tou mean it only boors to a blue screnn???
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.

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