Attempting to install 10.10 Desktop Beta 1 to a MBP5,1 led to the symptoms shown in this bug for lucid: attempting to install or boot to the live CD yielded a black screen with blinking cursor.
Using the work-around (nouveau.noaccel=1 blacklist=vga16fb) allowed the live CD to boot. I then switched to the nVidia driver and the system boots fine.
Attempting to install 10.10 Desktop Beta 1 to a MBP5,1 led to the symptoms shown in this bug for lucid: attempting to install or boot to the live CD yielded a black screen with blinking cursor.
Using the work-around (nouveau.noaccel=1 blacklist=vga16fb) allowed the live CD to boot. I then switched to the nVidia driver and the system boots fine.