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Post originale di: Daniel ,

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1) Take backups with time machine and reinstall OS X. After you installed, setup assistant appears. On Do you alreaddy have a mac screen, choose restore from time machine backup.

2)If reinstalling does not help, have you ever spilled liquids on it? If so, open up your macbook and check the motherboard for any visible corrosion. If you found any corrosion, check this guide: [http://www.ifixit.com/Wiki/Electronics_Water_Damage|iFixit Liquid Damage Guide]

3) Is the hdd showing any signs of failing? Boot from OS X install cd (Hold c key when booting) and go to utilities>Disk utility. From disk utility choose first aid> Verify disk. If problems are found press repair disk.

My compurers go black when hdd is failing, maybe yours does the same.

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