It may have been corrupted or tampered with during downloading." Manually restored El Capitan - this time it booted into the installation process, however, first I got this message "This copy of the Install OS X El Capitan application can't be verified. Made OS X Recovery Disk Assistant v1.0 - booted to Disk Utility and did the manual restore of Sierra and I still got the circle with line when I boot up. I used the following instructions for that. Downloaded Sierra using another compatible Mac and made a bootable SSD drive - when I boot from the drive it just shows a circle with a line. I tried the fix available here and it doesn't work. Over the network El Capitan installation doesn't work as it says "This item is temporarily unavailable. The system was wiped when I received it and I'm having a hard time installing the OS. I'm new to Mac's and need some help installing either Sierra or El Capitan. I recently acquired a late 2009 iMac from someone who upgraded to a newer iMac and wanted to get rid of the old one.
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