Im trying to restore my imac as im selling it. Ive followed advice from the internet where when you start it hold down on 'alt' until 2 disks appear but this never happens. I went into Disk Utlity to earse but the earse button is shaded out so it wont let

Im trying to restore my imac as im selling it. Ive followed advice from the internet where when you start it hold down on 'alt' until 2 disks appear but this never happens. I went into Disk Utlity to earse but the earse button is shaded out so it wont let

What OSX was installed when you purchased your Mac? Even though it was installed you should have received the install disk(s) as the Utilities are on those.
If you do not have the install disk you can try contacting Apple and see if they can supply one,(explain you never received at purchase) you will need the build info of your machine, which can be found by clicking the Apple logo in the menu bar>About This Mac>More Info, and it should be in the first window under hardware overview. Model Identifier.
Customer Support:
800-767-2275
Erase instructions
http://support.apple.com/kb/HT3910

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