Hi, I have a fresh new install of FC 13 64 bit, it seems working fine until 1 moment where everyhting freezes and the only rebooting is the possible solution.
I see a siren when I log as root, it has some information of which services started with status OK/Failed but no indication what went wrong How can this be investigated as I am not so system, I am more application and developer

Does it hang much after startup? Does it hang during startup? What was running when it happened?

I have F13 running flawlessly since day 1.

Please send information so we can pass ideas about what to look for.

check your logs and see what might be the culprit...
cat /var/log/messages

also, try changing to console 1
(ctrl + alt + f1)

then try a

(ctrl + c) - that will kill Xwindows

then try from bash

start x


That should start your X Window Session Again

It is not at startup nor boot time. I log, use it for a certain amount of time, then all of a sudden it hangs and can do nothing.
For instance, this morning when I was reading your responses, it hanged, I tried to follow zer0signal's steps, nothing was happeneing and I needed to reboot.
I went through /var/log/messages, I could not find any hint (maybe because I am not expert in linux system :-))
Thanks for your help

try booting into run level 3
vi /etc/inittab
change the value from 5 to 3

save and reboot machine;

when you get to the logon prompt - in run level 3
logon as you
then type startx

if it hangs again in X

do - ctl + alt + f1
it should bring you back to command line
then hit clt + c that will kill the current X session thats running;
try to startx again


also when it hangs note what you were doing when it happened - might be able to draw a conclusion on where to look further; IE: listening to music, firefox, movie, empathy

I changed the inittab to 3, rebooted, logged as root, then typed startx, everything went fine except when I tried to do "switch user", I got a message box indicating
Unable to start new display
The name org.gnome.displaymanager was not provided by any .service files

So how can I switch to another users. I always need to have a session opened with my user name as well as root. That is because VLC doesnt run in root context, and my user, after givingh him all necessary privileges can not do a lot of things that can be done by root user.

Thanks

After changing inittab, logged as root, logged out , changed logon
su myuser
did startx, a new graphical session opened, launched evolution, deleted acouple of emails, then tried to delete other emails and HOP, FEDORA HANGED AGAIN, doing CTRL + ALT + F1 does absolutly nothing.

Since this morning, I had my FC 13 freezed, I rebooted, since that time FC tries to boot grapically and hangs on a blue page with a white appel iun the center, sometimes it manages (the apple) to have the letter F written inside and nothing else possible except Ctrl+Alt+Del
What is happening?

Not able to log in whatever mode

I want to add the following
One of the main things I changed this morning by folloing was the addition of a neww Virtual host to apache to listen to port 4431, which seems failing to start.

I followed instructions found at (Setting up an SSL-enabled Web site with Apache 2.2.4
)
http://techrepublic.com.com/2415-3513_11-167032.html
I didnt mention this as I didnt imagine that a service not being able to start would bring to a halt the whole system.


I rebooted the suystem using Ctrl + Alt + del, I noticed an error opposite to mod_ssl which indicates that "Private key not found"

I managed to boot with runlevel 1, then logged as root, I was requested a passphrase for my certificate that I installed this morning, then I was able to do startx,
it seems that httpd, mod_ssl was making it hanging. Now I reconfigured httpd to run automatically only on runlevel 4 anf 5 so in text mode does not run and allows me to run it manually

Now the question is how it is possible to make httpd run without requesting this passphrase, or at least give it to him not manually.

Thanks

In fact after deep investigation, when FC hangs, I am able to access FC box with remote desktop which lead me to think that it is something else.
In fact it is the keyboard that freezes and does not respond anymore.
I tried several keyboards, it works sometimes for 1 day, sometimes 2 and sometimes 1 hour and it hangs.

What can be the root of this issue?
Thanks for your help

I have my FC 13 hangs from time to time while I am logged as root and opened a thread (http://www.linuxquestions.org/questi...o-time-838599/).
Until today, I thought it was keyboard that freezed.
I manage top connect remotly using xrdp from another machine with a user other than root, everything executes very slowly.
I discovered that Both CPUs on my box are 95% and more, they never get below.
In a terminal session, when I issue "Top" command I get this

It seems that the xOrg (for root session) consuming 95 to 98 %.
I tried killing the xOrg as follows using the process id
it doesnt wor
I need to reboot my machine in order to be able to work directly again.

Thanks for your help

A couple of suggestions:

1. You might need more RAM
You didn't show any of the statistics at the top of your "top" output, but I'll bet "swap" is non-zero. Which could easily account for the side effects of "high CPU" and "system freezing".
You MIGHT be able to solve the whole problem with more RAM.

2. You're running Firefox (good), and Flash can be a major problem, too.
Consider installing the Flash blocker and see if that helps:

https://addons.mozilla.org/en-US/firefox/addon/433/

3. Finally, try "kill -9" (instead of just "kill") to see if that helps.

"init 3" might also help.

Thanks for your response.
I have 2Gig physical RAM, 4G of swap
I rebooted may machine since yesterday, Here is output of free

here is the output with -l
Yers, I have frefox but not flash, I never succeeded in adding Flash to my machine