Logging in as a root???
 

I've just installed Mandrake Linux 9.2 on my laptop (Dell inspiron 8200) and I managed to set dual boot along with Win XP. However, there is a problem with the display, my screen is very small when booting with Linux.

I found out from other threads that I need to edit the file /etc/lilo.conf and to change the vga to 791, but when I do that it woun't allow me to save the changes (read-only file) as I'm logged in as a user not root. So, how can I log in as root in Linux.?

It's confusing because during the installation process I set the user login and password but for the administrator it asked for a password only??? and also when booting with Linux some times it's not asking for login details???

well at a terminal you type :
su -
and then you will be prompted for that administrative password

if you are at a "login:" prompt then the username is :
root
and again you will be prompted for that administrative password you supplied ...

to login as a root:
name: root
password: XXXXXX(your root password)

if you login as a user and you want to chang to root:
go to terminal, then type"su"
it will ask for your root password, then you will become root

Oops, DrOzz answered before me :)

Thanks,,,
 

Thank you guys, that did solve the problem and my screen now full screen.