Trouble installing snow leopard with external monitor

Hi guys, I got myself into a bit of a pickle here, I have an iMac intel (late 2006) that I broke the display on a couple years ago. Recently I tried to resurrect using an external monitor until I could find a decent priced replacement display. I decided to upgrade the OS since I couldn't get any upgrades for my programs because I was still running Tiger, anyways I begin the install of Snow Leopard and my external monitor goes into second monitor mode with nothing displayed except the wallpaper and I can't eject the snow leopard cd or see whats going on, on my built in display. I also can't use my keyboard to access the display settings.

Please help!

 

UPDATE: After forcing the install disc out at startup, the computer has a yellow tint to the display now.