I am lost some one please help I have a dell dimension 2300 that will not reboot or shut down I am running XP I went to event viewer & here is what I saw...warning 3/30/09 12:03:17pm user32 event 1073 system rroompc....then open window to read....The attempt to power off RROOMPC failed NT AUTHORITY\SYSTEM
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
* Use either the graphical user interface (GUI) or the shutdown command again.
* Press CTRL+ALT+DELETE, and then while pressing CTRL, click Shut Down to force a shutdown.
* Press the reset or power button on the computer.
Not terribly helpful I know, but that's what it is, and it's probably because:
"Currently there are no Microsoft Knowledge Base articles available for this specific error or event message. For information about other support options you can use to find answers online, see http://support.microsoft.com/default.aspx"
Now I haven't visited that link, but I bet it'll be as useful as a chocolate teapot ;)
If you press the power button for at least 5 seconds the machine will power off (same effect as unplugging the power). If your system has somehow been corrupted, however, you may not be able to boot it again.
In that case I would recommend taking a backup of all your files using a Linux live CD and an external hard drive and then reinstalling XP, but that should be a last resort.