Linux (RedHat) boot does not enter the graphical interface, the gray screen appears. ____linux

Problem Description: Install some software such as DB2, Oracle, etc., may appear boot system
Checked all kinds of hardware devices, but did not appear in the landing interface, the appearance of
is a gray screen.
Resolution process:
A preliminary guess is that the graphical interface cannot be started. The way to further demonstrate is to start
Press the Entre key to select the system you want to change, such as Red Hat Enterprise
Linux as (2.6.9-22el), and then press "E" to indicate that the system is edited. Then select
Kernel ... Items are edited by "E", and an uppercase "S" after the edit item indicates that the single user initiates the kernel.
Then press "B" to start.
When the boot completes, the character-mode Linux system runs, and the command startx is run, if the graphic is not present
The interface will complain and solve the problem according to the error.
"Error:could not open default font ' fixed ' is generally reported." Workaround:
Edit the/etc/x11/xorg.conf file. "Fontpath" in "section ' Files"
The paragraph adds the following font path definition:
Fontpath "/usr/x11r6/lib/x11/fonts/misc" (first comment out the original)
After saving, restart X-window (STARTX).