HELP! Computer keeps rebooting after installation

[YoungXO]

Okay, so I'm trying to install Leopard on my Sony VAIO with the iATKOS. I've gotten all the way through the install to the point where you see the green check mark that's telling you to restart your computer. So I take out the disk and restart my computer, then it boots up and gets to where it asks my to choose a partition. I select the one I installed iATKOS on and then it loads up to the gray screen with the apple logo on it. After a minuet of loading, my computer just restarts and doses the same thing over and over again. Can anybody please HELP HELP me!