i have a mac book pro.
i do not personally own another mac, but i can access a friend's mac if necessary.
i do not have the install disk
i held down the shift key immediately after the tone, but it did not show "spinning gear" or safe mode. it went directly to the windows portion of the hard drive. during start up i saw a grey screen, then a black screen with a blinking cursor on top left, then windows start up. no apple icon and no desktop.
ok, so i started the computer, held the keys and released them after the second tone. i got a grey screen and a third tone and then it went back to windows on its own. i'm still locked out of OS. is it possible to designate more gigs to the the mac HD from the windows side?