re-setting video for LCD on G4

[Grant Lenahan]

Hello,

I just installed YDL 2.3 on a G4 powermac with a large LCD attached.  
works great, except:

The desktop does not fit on the screen - I have to scroll around to see 
the edges (its "dock, menus, etc).  An engineers' note in the 
instructions say:

LCD monitor with a Cube or G4 : At the yaboot prompt (after you have 
chosen "L" for Linux):
linux video=aty128fb:vmode:14 [ENTER]

Well, easier said than done.  after I have chosen "l' for linux, its 
off and on its way - immediately.  I've tried quickly typing "l linux 
video=aty128fb:vmode:14 [ENTER]", but that gets me to a boot prompt 
that let's me select the kernel - and it looks for a linux video 
kernel.  not good.

Any advice?

Grant

ps: I also have YDL 3.0.  big improvement?  Should I just re-install 
with that?