Cannot change boot sequence - Stuck with CD

[eye4nature]

I tried installing Leopard on my Intel 2006 Imac.
After restart the disk wont boot, i cannot eject it and i cannot boot at all.
The only thing that works is Command + S that brings me to a black screen with an option to type commands but i have no idea what to do ? Very frustrating, please help !

Thank you

 

[stukdog]

Holding Option won't give you the disk to boot from?

Will the cd eject if you hold the mouse button while rebooting?

 

[Hrududu]

Did you set your hard drive as the boot disk? Just boot up from the CD and double check your startup disk.

 

[Eidorian]

Hold down Option to bring up the bootloader or just use Startup Disk on the DVD.

 

[Cave Man]

I tried installing Leopard on my Intel 2006 Imac.

Did you verify the drive is initialized with a GUID partition map?