LOUD beep when booting osx


i finally got all 4 OS's on my single HDD laptop. 7, xp, ubuntu, and osx. well almost. they all boot from win7's boot loader, except mac. i installed mac using the nawcom boot cd. it installs and says "install successful" and then i click to restart. then, per the write-up on nawcom's site, it says to re-insert the boot cd, and boot to the newly installed mac OS. when i do that, it does its thing for a few minutes, then it just haults and a LOUD constant beep comes from my laptop and will not stop until i turn it off. i dont know what it could be. any idea?