text mode question

According to everything I've read, changing /etc/lilo.conf from
vga = normal to vga = extended changes the display from 80 x 25
to 80 x 50. The problem is, it has no effect on my 17" monitor.
Anyone know what I'm missing? Thanks.

--

Bob Holtzman
"If you think you're getting free lunch,
...check the price of the beer!"