iATKOS - Mac OSX boot stuck at Gray Screen?

My system is a Toshiba Qosmio X300 laptop with an external SATA HDD connected via USB. I was able to instal iATKOS v5i onto the system without having to customize. The only issue was the laptop key/mouse could not be used (i had to USB it).

I got greedy and went back to the iATKOS DVD to customize bu unfortunately now when trying to boot back into OSX i'm faced with a gray screen and the apple logo. After a few minutes a crossed circle appears in the center of the screen indicating something was wrong?

Any ideas on what to do?