improper shutdown

What Computer do you have (vendor, model; specifically mainboard model, CPU, graphics card, ...) and how are you trying to shut it down?

i have p4 2.4 ghz intel 845 mainboard . i shut down it from session menu. click on icon and select shut down.

same problem with log out also any help?

Mh... I don't know, but it sounds like a BIOS problem. Has it worked on an older version of Ubuntu or a different distribution? Or even in Windows?

Wait, logout, too? logout as in, going back to the login screen? If so, it sounds like an application problem. Have you tried closing ALL applications before logging out? Can you attach your /var/log/Xorg.0.log and /var/log/Xorg.0.log.old?

my shutdown works fine with windows. can u explain how to attach file here, log file is too long cant copy paste here.

You can use sites like http://pastebin.com/, but don't forget to go through the log first and see if there is sensitive information in it -- anyone on the Internet can read the log! Just scramble the data, but leave the lines as such intact.

sorry the site you mention require sign in . is it possible to explain certain portion of log file related to shut down problem if so explain about it.

any help for my problem?

Sign in? Uh... try pastebin.ca/upload.php -- it's easier if you just upload the whole thing. By the way, if I can't provide you with an answer, try asking in http://askubuntu.com/. I don't have much time, so I'm slow to answer.

Thanks Mr Nikolaus for ur advice. I have posted my log file on pastebin.ca and the url is http://pastebin.ca/2093832.
if possible try to help. thanks again.

Hm, can't discern anything from the log... Say, about what happens when you try to shut down the computer, what do you mean by "cpu continue processing"? Moving the mouse wakes the computer immediately, like if you just had a screensaver on? Or does the screen stay blank and you can't wake it up anymore, while the fans keep running?

no nothing happen once blank screen appear mouse and key board control are lost i have to just power off the switch.
The red & green light of CPU blinking so i think that shut down incomplete or as u said fan keep running.

Sounds like a kernel hang.. sorry, I don't have the expertise to help you there :( Please try askubuntu.com and provide all the information you provided here.

thanks for cooperation.