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I recently installed redhat7.3. I originally installed it with a 19 inch AOC monitor. Now i brought it to my office which has a 15 inch AOC monitor. It ll go thru the boot up process but just after the login prompt the screen stays black and monitor stops receiving signal. im sure its just the configured monitor which must be changed, but i cant do that. i understand /usr/bin/X11/Xconfigurator is for configuring hardware but i cant get to it. i dont even know how to write commands. please help me! i ordered a linux book but i live in honduras and it wont be another 2 weeks til it gets here
Do you know specs for this new monitor, what is the model of it BTW? you need horizontal sync and vertical refresh rates, then you can hand edit your /etc/X11/XF86Config-4 file in the Section "Monitor" change HorizSync and VertRefresh to appropriate values. And to get to the prompt at least at lilo prompt (Ctrl-X gets you to the lilo prompt if you are using Graphical Lilo screen) enter
linux init 3
If you're using GRUB to get to the prompt I believe (I am not sure I don't use GRUB) you need to press e or ctrl-e and then enter the command above.
Thanx...now can i just add this much more...Im extremely new at this. i dont know anything about linux yet. like i said, im waiting for a book. all i know is that redhat boots like this...
2. redhat OS bootup screen (where "p" takes you to a grub commandline prompt
3. all the configuration files and services load up....
4. a login prompt that lasts about 1/2 a second
5. this is where it goes black
so where do i enter those ctrl e or e commands? and how do i edit the file?! yes, i do have the aoc monitor info. but i need to know how to edit the file and where do i access the file from, what prompt screen?
ok when you see grub menu hit p (if you say it takes you to command prompt), but I believe it is still ctrl-e, you should see a boot prompt type in the entry to boot linux - probably it is called linux and add init 3
boot: linux init 3
you'll boot into multiuser mode without X (GUI), login, then you'll see something called command promp it looks like [neo@matrix neo]$
now here type su [neo@matrix neo]$ su
you'll see [neo@matrix neo]$ Password:
enter root's acount password (you remember it, don't you)
now make a backup copy of your exiting /etc/X11/XF86Config-4 file [root@matrix neo]# cp /etc/X11/XF86Config-4 /etc/X11/XF86Config-4.bak
now there are different command line editors for linux, the bets are good you have vi (it is a little awkward to use for a novice), see if you have pico
type pico [root@matrix neo]# pico /etc/X11/XF86Config-4
locate the entry described above eraze old info with backspace or delete and type the new info when done hit crl-o, enter and then ctrl-x
logout of root with exit command and type startx
If pico is not available use vi [root@matrix neo]# vi /etc/X11/XF86Config-4
with up/down arrow keys locate the appropriate line now hit i you'll see at the buttom of the screnn -INSERT- meaning you are in edting mode of vi edit the file in the way it was discussed when done hit ESC key and press letter z twice while holding a shift key
you are done
exit off root and try startx
Ouch I almost forgot, is there kudzu running on the system bootup? I encourage you to run it.
Before you get your hands dirty with editing configuration file when in runlevel3 login as root with su and run /usr/sbin/setup go to services and select kudzu from the list it should place asterix * against its name when you press space key, then reboot the machine with reboot command and again bring it to runlevel3 during bootup if kudzu picks up the new monitor it will try to configure it for you, if not then go ahead to edit your config file.
Thanks for the help. However i was not able to do it. I reach the redhat bootup screen, i enter "p", i enter the root password, then i have 3 command lines..
i can edit those or add a new commandline. but i do not get a boot : linux prompt nor does ctrl + e do anything at this screen. and if i let it boot up itll go through all the mounting and services and what not, then flash the localhost login: prompt for like a millisecond and then its gone...
i've had a similar problem installing
on a Dell Inspiron 8200 with RedHat 7.3.
using rpm from KDE, after a complete reboot
resulted in a login screen contiuously swapping
from text to corrupted graphic, both unwilling to
accept any keyboard input other than Ctrl-Alt-Del
(not even Ctrl-Alt-F1...)
- wait for the GRUB screen
- select the Red Hat line
- press "e" to go in edit mode
- select the line that begins with "kernel"
- press "e" to edit the line
- append the keyword "single" and press enter
- press "b" to boot in single mode
And it works! The boot sequence stops just after mounting the filesystems with a # prompt.