I have been using bootcamp on my Macbook pro for a couple of months now to run windows vista.
I have always been able to use the option key during bootup to switch between them with no problem at all.
Now my computer auto matically boots into vista. I can use the option key to bring up the prompt at the startup to choose mac or vista, but even when i choose mac it still boots into vista.

Does anyone know whats wrong with my computer? Please help.