Rescue mode

[Charles Trois]

Hello!

I had YDL 3.0.1 running on my G4 iMac, but, due to some foolhardy 
changes (probably in /etc/fstab), the thing does not work any more
and I am trying to repair it.

So I have booted with install rescue and immediately got an error 
message: "An error occurred trying to mount some or all of your system. 
Some of it may be mounted under /mnt/sysimage".

Indeed I see in the shell that /mnt/sysimage contains only dev, home and 
proc, whereas the whole system should be there (if I understand 
correctly). There is also / , but it looks queer: fstab seems to be 
absent from /etc.

At this stage, having no previous experience in this field, I feel 
uncertain of what I am supposed to do. On the Net, although there are 
plenty of references to "rescue", none deals with anything similar to my 
case.

What I want is just to edit /etc/fstab, and I don't want to try anything 
that would make things worse.

Could somebody advise me, please?

Charles