Mac OSX did not boot (on a Macbook)

Hello. I have what seems to be a serious problem with a MacBook. It just won't start. When I turn the power on, it stays a while in the grey blank screen, the a Folder icon with a question mark on it appears, and flash two or three time.
This MacBook have OS 10.4 installed. I try to boot from my Mac OS 10.5. Which works all the way, but when I take a look in the disk utilities, it says that the partition where OSX is installed is not mounted, and it is impossible to repair the disk.
I read the following support page :
http://docs.info.apple.com/article.html?artnum=58042
Then, I tried to reset the RAM as suggested and described here :
http://docs.info.apple.com/article.html?artnum=2238
It didn't worked, the OSX partition still not mounted. There also something else really strange. The computer is not ersponding to any booting command. I cannot hold the option key to choose the booting drive, I can't use cmd+S to acces a terminal windows, I can't press 'C' in order to boot from the CD, and I can't even get my OS 10.5 CD out of the computer ! (I really need it out of there !). The ony responding key are those I use to reset the RAM.
All I wanted to do is to be able to, at least, make a copy of this hard drive to save the data... but I fear the worse. I'm not really use to Mac system, but it looks a lot like a major disk failure
Thanks a lot everyone ! Any help is welcome, my friends is totally freaking out !

Ok, so, I hooked up the broken MacBook to my working MacBook with a Firewire cable. on my MacBook, it first detect the macOSX CD trapped inside the broken one. I eject it and take it back (yéé!). Then, the Windows partition come up, but the Mac partition still not showing up. This really looks bad I presume ?

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