I own multiple macs one of which is a iMac 7.1. In February I chose to replace the hard drive as it had <1GB remaining in space. A local business specializing in Macs did it for me (Mac Store...for those of you from WA/OR)...worked perfectly and has been running great since. I downloaded the Lion update but the installer will not even load/start. An error mssg pops up saying >2GB of storage are required. The new HD has about 500GB free...it's as though it thinks the old hard drive is still there ???? Any ideas?? Many thanks for viewing and your thoughts are appreciated.