OS X won't start after installing Bootcamp

[iKolja]

I just installed bootcamp,and the drivers from the apple cd,it went smoothly
it was installed on a new 20GB partition
I use Windows XP,and OS X 10.5.7

Now,after the windows was installed,i restarted my mac,holded option,and chose the OS X disk...
there was the apple logo,than a blue screen,and it stayed that way...
blue screen was changed by a bluish-gray screen every 25 seconds or so,but that was short,and it got back to the normal blue screen...
that went on for some time,and i had to hold the off button for 5 seconds to turn it off...
i tried starting os x from safe mode,but it only started windows on safe mode,even though i chose the os x disk...

please help !
thanks

 

[Pacpod]

When you say "OS X" disk, do you mean the actual physical OS X install disk that is in your drive or are you referring to the OS X startup on the actual hard drive?

 

[iKolja]

When you say "OS X" disk, do you mean the actual physical OS X install disk that is in your drive or are you referring to the OS X startup on the actual hard drive?

osx startup

 

[iKolja]

Anyone ?
Tried starting with safe mode,but it still doesnt work