ok, So i've followed your guide fully, to the degree that i've inputted the code into -s mode meaning I could log into 10.5.8 with my 260 active, and then done all terminal codings with no errors, but then when I come to reboot, it goes back to sleep on start up [monitor] :\

Anyone have any ideas of what im missing?

running a GTX260, which worked on the 285 drivers in 10.5.7