'you passed an undefined mode number' at boot

i get that message at boot and it says press 'return' to see available options. it seems like a video thing. the different options affect the size of the font at boot. all the options seem to be in hex. which one do i choose to stop this message from appearing at boot? i tried setting in values(tried option 5 & 6) but it still asks me that question at every boot...

the options are:

0. 0f00 80x35
1. 0f01 80x50
2. 0f02 80x45
3. 0f03 80x28
4. 0f05 80x30
5. 0f06 80x34
6. 0f07 80x60

my monitor is a samsung 172x lcd connected via dvi. native res is 1280x1024

Just curious - could you post the results of

cat /boot/grub/menu.lst