[noonespecial]

yes, I have used diskpart everytime, things screw up once i update MAc osx to 10.6.7, not when I install ubuntu.

[crabhunter]

Did you do this?

Convert the drive to GPT and create partitions
boot off the Win7 media
once in the install, get a command prompt by hitting Shift-Fn-F10
run diskpart.exe to convert the drive to GPT and partition the drive - 3 partitions, with empty space at end for Ubuntu
list disk
select disk (your hard drive, should be 0)
clean
convert GPT
create partition EFI size=200
create partition primary size=(size in mb for OSX - mine was 50000 MB, of a 160 GB HD)
create partition primary size=(size in mb for Win7 - mine was 50000 MB, of a 160 GB HD)
list partition (a * should appear on the third partition, that's where you will install Win7 later)
format fs=ntfs quick
exit

[noonespecial]

I did exactly this, every time, except for it being a 750GB hard drive. Then, after win 7 is installed, i use the linux usb to "carve" out an ext4 partition from the win7 partition, which after gptsync'ING results in a perfectly booting triple setup. ONCE 10.6.7 UPDATE is applied, I get BOOT 0:ERROR ON OSX PARTITION. After using special 2351 nbI, and gptsyncing again, win7 will boot, and osx will boot "ONLY WITH OSX USB INSTALLER W/CHAMELEON" but ubuuntu has to be re-installed again, and gptsync'ed again. Again, all three OS's work but OSX only boots with usb installer for OSX, I cannot seem to get bootloader to install onto osx partition once it is update to 10.6.7

[crabhunter]

OK, the only thing I did different was when I made my partitions I left free space for linux not a partition.Then when I installed Linux I let it use the free space but made sure it's boot loader went on the / partition. I then used the nbi usb stick to boot into Linux, ran gptsync then used disk part to make windows partition active and repaired windows. Then I used disk part to make OSX partition active and I was back to the osx boot loader.
I must point out you have to fully update to 10.6.7 (or .8) and run nbi before you install Linux.
I have found running nbi after linux results in a grub error that I have not been able to work around.
HTH.
Mike