I got a iMac with Leopard and I would like to upgrade to Lion. I have a retail copy of Snow Leopard so as to install them first.
When I open the DVD it shows the Installer and some other folders.
I open the Installer and then it shows an error:
"Mac OS X Snow Leopard cannot be installed on this Computer"
I open the folder with the instructions and I find the hardware requirements. I check the "About this Mac" and everything seems to be OK.
4gb Ram (Snow Leopard needs 1gb)
146gb Free Space
Intel Processor etc...
I tried to boot to the DVD by pressing the C button when starting and it shows the same message again.
What should I do?

Any help would be appreciated!
When I open the DVD it shows the Installer and some other folders.
I open the Installer and then it shows an error:
"Mac OS X Snow Leopard cannot be installed on this Computer"
I open the folder with the instructions and I find the hardware requirements. I check the "About this Mac" and everything seems to be OK.
4gb Ram (Snow Leopard needs 1gb)
146gb Free Space
Intel Processor etc...
I tried to boot to the DVD by pressing the C button when starting and it shows the same message again.
What should I do?
Any help would be appreciated!