Problem with default boot drive (BOOT CAMP).

Hi,

I have mac os x version 10.5.7 running on a macbook pro 2.4GHz Intel Core 2 Duo. And my boot camp version is 2.0.

I installed windows vista via boot camp, then uninstalled it following the procedures in the boot camp help file. However after uninstalling windows, whenever I start my laptop it is unable to boot into mac automatically. And after a while shows a screen showing an error that it could not find a bootable drive. So I have to manually press alt(option) button and select the Mac drive to boot into mac os. There is no other os installed than mac.

Can somebody please tell me how do I fix this? As in, how can I make it automatically boot into mac?

KDJ