I erased by Hard drive without backing up. Now, when I put the install disc one inside, it says that Mac os x cannot be installed on this computer. The computer was running Mac os x 10.5.8. Any help?

I erased by Hard drive without backing up. Now, when I put the install disc one inside, it says that Mac os x cannot be installed on this computer. The computer was running Mac os x 10.5.8. Any help?

Boot from your DVD by switching on the Mac & inserting the disc, restart it & hold the "C" key. Once the installer window loads & you have selected your language, choose Disk Utility from the Utilities Menu. You will then need to select your disk from the menu within Disk Utility & choose how you wish to format. It should be formatted Mac OS Extended (Journaled).
Once it has formatted, you should then be able to install the OS.
PLEASE REMEMBER...that formatting a disk will completely erase it's content. Be sure that you don't wish to recover any of your previous content before doing any of the above.
Ben

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