Installation DVD does not recognize my internal HD on a 2008 iMac

I'm looking for suggestions here.  My 94 year old mother has used the iMac 2008 8.1 for internet e-mail.  We needed to upgrade its OS X 10.5 to be able to upgrade to a new version of safari to access some banking sites.  I upgraded the memory.  Sister has an iMac with OS X 10.6.2 Installation/restore dvd 2010.  I went to update.  I have caused the initial problem because after reading info seemed I could create a second partition on the hard drive of 250 GB and use Time Machine to back up before preceding.  See not all the warnings on the addition of the partition. (Yes, if I had not forgotten my external hard drive I should not try that, but I forgot it.)  Things seemed to make the partition, but time machine bogged down and hung up.  After trying many things, I found myself deleting and resetting on the internal extended (journaled) using HD, recreating a single partition using the guidelines GUID, thinking that I could just do a clean reinstall.  BUT, while I can check/fix delete etc the internal disk utility when HD started from my external hard drive so I boot from the OS install DVD it does not recognize the internal HD.   ? ? ?   Gives cannot update this post Mac.  If I run the Setup from the beginning of the disk upward once again, no offers to go to in the installation program.  I can access everything in THE RUNOFF when the post boot drive.

Why THE works on the internal HD of the post start up (which was made with the 10.6.2 installation DVD), but not when started to leave the DVD left me puzzled. The DVD is not just see the it.  When it is started from the DVD with the external drive, he sees very well.   You are looking for ideas, thank you in advance.  By the Way the machine had no problem before starting this :) live and learn!


If I understand what you were doing, you tried to use a Mac installation disc and to update another Mac? Is this correct?

If I am not mistaken, which simply does not work. The installation provided with Mac discs won't work on another Mac, the original installation discs are machine-specific.

Tags: Mac

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