You passed an undefined mode number

[Elijah <desiderata@softhome.net>]

Hi! I'm new here :)
Hello!

I have a problem here ... 
This error occured ever since I upgraded from geforce2mx to geforce4mx:

-------------------------------------------------------------
Booting 'Debian'
root (hd0,1)
Filesystem type is ext2fs, partition type 0x83
kernel /vmlinuz ro root=LABEL=/ hdc=ide-scsi vga=791
[Linux-bzImage, setup=0x1400, size=0x1330eb]

You passed an undefined mode number

Press <RETURN> to see video modes available, <SPACE> to continue or wait
30 secs

Video Adapter: VESA VGA
Mode: COLSxROWS:
0 0F00 80x25
1 0F01 80x50
2 0F02 80x43
3 0F03 80x28

4 0F05 80x30
5 0F06 80x34
6 0F07 80x60
Enter mode number or 'scan':_
-------------------------------------------------------------


I've already read what's on /usr/src/linux/Documentation/vesafb.txt
(docs from slack) ,
some info there is just too complicated for me, I've tried out using
vga=0x301 , vga=scan, vga=ask etc. etc. and none could give me a better
resolution. 
Passing the modes from 1-6 did work well, but the resolution that I got
used to from using vga=791 is what I really miss from my old card.:(
I really want a better resolution than the default one ... 

oh, btw, I'm using grub.


Many Thanks for your time,
Elijah