bootcamp ruin my macbook!

[beloved84]

I installed bootcamp and when it came to the part where I needed to install windows one of my program froze so I had to restart my computer by holding down the power button. Now when I turn it on... my mac os doesn't start. It goes from the white screen to a blank black screen with a small blinking bar in the top left corner. how do i fix this?!

[Nermal]

Hold Option at the boot chime and it should give you a menu where you can select the OS X volume.

[ebouwman]

try holding "alt" when you restart and choose the mac disk, and take out the installation disk for windows