Hi Cheryl, Thanks for your further comments. Indeed, my HD has SL OSX 10.6.8 and is the original drive some 3 years old. The drive has not been re-partitioned and my external drive does have a re-bootable version on it created by SuperDuper. I have never had any problems upgrading the operating system. Hope that helps Ray On 22 Jul 2011, at 17:42, Cheryl Ann Homiak wrote: Ray: Is Snow Leopard on the hard drive? I'm assuming it must be or you couldn't have downloaded the installer from the app store. Well, actually you could if you had Snow Leopard elsewhere or where using a dvd. You aren't the only one with this problem as a quick google showed me. Is this the original hard drive or had you replaced your hard drive at some point? That was one possible cause I heard though nobody seemed to know why this would make a difference. One person who had replaced the drive said that repartitioning to make it slightly smaller solved the problem for him but I don't think it's the size per se. If you are backed up and can move the Installer App somewhere safe, you could try just erasing and repartitioning your hard drive but I know that's kind of a drastic step when you can't be sure it will solve the problem; I'm not recommending it necessarily but just listing it as a possibility. -- Cheryl "Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength and my Redeemer." (Psalm 19:14: Bible KJV) > > Click on the link below to go to our homepage. > http://www.icanworkthisthing.com > > Manage your subscription by using the web interface on the link below. > //www.freelists.org/list/macvoiceover > > Users can subscribe to this list by sending email to > macvoiceover-request@xxxxxxxxxxxxx > with 'subscribe' in the Subject field OR by logging into the Web interface at > //www.freelists.org/list/macvoiceover > Ray Hazan Sussex by the sea Ray .hazan@xxxxxxxxx Skype: raypqq > > Click on the link below to go to our homepage. > http://www.icanworkthisthing.com > > Manage your subscription by using the web interface on the link below. > //www.freelists.org/list/macvoiceover > > Users can subscribe to this list by sending email to > macvoiceover-request@xxxxxxxxxxxxx > with 'subscribe' in the Subject field OR by logging into the Web > interface at //www.freelists.org/list/macvoiceover >