installed mandrivia with boot camp, now i can only boot in mandrivia.

help? I think i wiped my disk and now I only have mandrivia. when i hold the alt button at boot it only shows the other OS, no Mac OS

anyone?

nervermind, i was able to boot into 10.5 just now. thanks anyways

so it booted, but only from the leopard install disc. so i tried to do the install where it keeps everything. no luck. it found the boot camp drive and my Mac drive partitions the first time but they were both greyed out. the second time i tried they were not even found. what can i do

so i guess there isn't much I can do, is there? I guess i'll just sell my Macbook then