8400gs problem......help please

components:
gigabyte g31m-es2l rev 2.0
gigabyte gv-n84s-512l nvidia geforce 8400gs
e6600 cpu
2gb corsair ddr2
500gb sata hd

have been trying to install using this guide:
=****************>> INSTRUCTION IS NOT COMPLICATED - ITS V - Mac OS 10.6.5 on G31M-ES2L

if i switch the pc with no os…the hdmi(with hdmi converter),dvi and vga all work.
i dont have a monitor so i have been using my 42" led lcd tv…has vga and hdmi.

the following is when its connected to the tv via hdmi.
when i install myhack onto the memory stick…if i tick the graphics enabler…it installs ok but when i restart i just get a black screen.
if i install myhack without the enabler it…it restarts fine but in the graphics card part…the card isnt recognised.

if i leave the enabler off and install nvenabler64.kext then i can get vga through the vga and dvi ports…can also change the resolution upto 1280x1024 i think it is.
also the graphics card is recognised and it can see the 2 displays and allows me to select 1080p for the hdmi to tv…but if i switch it off…unplug the vga and just have the hdmi in…i just get a black screen.
i have also tried a dvi to hdmi adaptor but the results are the same.
the tv flashes up its own display(like when u change channel) and says 1080p @50hz so it seems like a signal of sorts is getting to the tv.

any ideas or help would be greatly appreciated.