Installing snow leopard on a imac that won't turn on

When I tried to turn on my imac this morning, the fans turn on, but the screen goes grey with the logo on it then turns straight back off again. I tried clearing the P-Ram to no avail. Then I tried to reinstall the disks but the computer says that the disk can't be installed because the harddrive can be configured. I've now got a snow leopard disk that I am trying to install instead but as the computer won't stay on it won't lwt me and when I try to turn on the computer holding the c key to start the computer from the disk it just stays on the grey screen with no sound from the fan. Has anyone any idea what I can do?

When I tried to turn on my imac this morning, the fans turn on, but the screen goes grey with the logo on it then turns straight back off again. I tried clearing the P-Ram to no avail. Then I tried to reinstall the disks but the computer says that the disk can't be installed because the harddrive can be configured. I've now got a snow leopard disk that I am trying to install instead but as the computer won't stay on it won't lwt me and when I try to turn on the computer holding the c key to start the computer from the disk it just stays on the grey screen with no sound from the fan. Has anyone any idea what I can do?

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