Leopard installation failed, now CD is stuck

[PRRRRR]

I tried to upgrade my MacBook from 10.4 to 10.5 but the CD has a problem. The installation failed halfway through and now I can't remove it. I pnly get a blue screen and nothing else. I want to restore 10.4 but can't get the CD out to reboot with 10.4. I'm new to Mac, now on my PC, trying to get help from u Mac gurus.

 

[angelwatt]

Hold down the mouse button while booting to eject the CD. Other options from Mac Rumor Guides.