Not sure what you mean - are you starting up in text mode?
Once you have logged in in textmode, you can usually do
I. e. type startx in the terminal to get into graphical mode.
Otherwise, there should be a file called /etc/inittab where you can set the system to boot directly into graphical mode:
# inittab This file describes how the INIT process should set up
# the system in a certain run-level.
# Author: Miquel van Smoorenburg, <email@example.com>
# Modified for RHS Linux by Marc Ewing and Donnie Barnes
# Default runlevel. The runlevels used by RHS are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
# System initialization.
# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/sbin/shutdown -t3 -r now
# When our UPS tells us power has failed, assume we have a few minutes
# of power left. Schedule a shutdown for 2 minutes from now.
# This does, of course, assume you have powerd installed and your
# UPS connected and working correctly.
pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"
# If power was restored before the shutdown kicked in, cancel it.
pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"
# Run gettys in standard runlevels
# Run xdm in runlevel 5
Change the line
which is what you SHOULD have if you are starting up in text mode, to
i. e. change the 3 to a 5 - if you save the config file and reboot, the system should come up directly in XWindows on start.
I hope I understood what you meant... most distros these days if installed default -automatically- install to runlevel 5, i. e. start XWindows on boot?
Note that your message is ambiguous - if you literally meant the VGA Framebuffer function (i. e. you ARE in graphical mode on boot, but NOT in X, on your terminal) - that usually can also be configured as a kernel compile-time option?