OK. Keep us posted.

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Mac OS X 10.5.8 II Intel Celeron(R)@2.8Ghz II MSI MS-6577 v3.1 II Nvidia GeForce FX 5200 with 128MB II 768MB of Ram II Realtek AC'97 Audio II Realtek RTL8139 Ethernet II WDC W800BB-32FJAO IDE HD II IDE DVD ROM 16x

Upgrading my graphics card didn't work, so heres my screenshots (sorry about the quality of the pics)

1. This is the pic of what happens when i press F8 at the darwin screen.





2. This is what happens when i boot with -V, after this screen has past it boot the darwin command line again and i repeat all the commands as before but now i hit return insted of -V and all that does is boots into darwin again & again, i have to take out the cd to get into windows or it would just be a continuous loop.

It sounds to me a problem with your quad core. At the darwin prompt enter CPUS=1, this will disable the other cores and allow you to boot. After installing and reaching the OS X desktop, you should download and run DSDT patcher GUI and point it to your installed HD.

Hope this works!

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 Mac OS X 10.6.4 Retail || Intel Core2 Duo E8200 2.66GHz || Gigabyte G31M-ES2L || GeForce 6600 GT 128MB || Realtek ALC883 Audio || Realtek RTL8169 LAN || Samsung SpinPoint F1 1TB HD || Sony Dual Layer IDE DVD RW DW-D22A || Apple Aluminium Keyboard || Mighty Mouse

 MacBook Pro || 2.4Ghz Core 2 Duo || 200Gb HD || 2Gb Ram || NVIDIA GeForce 8600M GT

 iPhone 4 || 16Gb

first time i tried it the disk was making some noise like it was booting then it just went back to like before. Also there was nothing on the screen about 'loading HSF* File [Mach_Kernel.........] ect.