Impossible to install any bootloader properly

[CosmoHack]

Hello,

I have just installed Mountain Lion 10.8.4 from an USB thumb.

My goal is to have a dual boot including Windows 7 and Mac OS X, so I followed this tutorial to do so:
https://www.dropbox.com/s/djt18o0k82...20Pictures.pdf
My computer has the next specs:

Intel i7 2600K
Gigabyte GA-Z68P-DS3 Rev 1.0 BIOS F4
HD Seagate ST2000DL003-9VT1
2 x G Skill F3-12800CL9-4GBXL
MSI GeForce GT520

Essentially, what the tutorial says and what I have done is this:
1. Boot from USB to Mac OS X installer.
2. Go to Disk Utilities and set 2 partition scheme:
-Mac OS X (HFS+ Journaled)
-Windows 7 (MS FAT)

I also added a new MS FAT partition in order to store data, not another OS. So I selected a 3 partition scheme.

3. Turn off and install Windows 7 in the partition already created.
4. Install Windows 7 drivers (while I think that this is optional in this stage).
5. Turn off and boot the Mac OS X installer from the USB.
6. Install Mac OS X in the Mac OS X partition already created.
7. Run the already installed Mac OS X in the HD by using the bootloader that automatically starts with the USB thumb.
8. Download MBeast and install all new drivers (but the guide doesn't install Chameleon from MBeast).

In this point, the guide says that in the next reboot you won't need to boot from the USB, since Chameleon will run from the HD and you will be able to select which OS to boot.

To check it, I reboot my computer and Chameleon doesn't run, and when I say it doesn't run I don't mean it only appears for a little time: it just doesn't start. So the chain is: Turn On -> POST -> Windows 7, as Windows 7 loads just after the POST. Not Chameleon anywhere.

Then, I think that a manual installation would be good so I boot Mac OS X from the USB thumb, download the latest Chameleon and installed it (in a very Windowish way: "next-next-next..", as I have seen in some tutorials).

To check if it works, I reboot again and... no Chameleon at all: Turn On -> POST -> Windows 7 again.

The same thing ocurrs with other versions of Chameleon (including the MBeast version), Chimera and Clover. Also tried to install Chameleon on Windows and, of course, didn't work.

I must say that, in the point 2 (partitions), the guide claims for a GUID scheme. I tried it with GUID and also from MBR, both from scratch, with the same results.

I am starting to think that, I don't know why, but none of these bootloaders are getting properly installed in the MBR.. but how can I force them to do it right?

Thanks!

[Aju Deeju]

When booting into OS X use boot flag -s.

When the single user mode is reached type in:

>fdisk -e /dev/rdisk0

>flag n (where 'n' stands for the os x partition number)

>exit

>reboot