blank screen after boot... issues with activity settings?

For some reason, sometimes after I just turn the computer off by pressing the power button while hooked up to the video mount, I’ll turn the computer on and (after it automatically logs into the standard user) come to a blank black screen. The only thing I can access is by pressing Alt+Tab to get a “no present windows” window, and thats it. Could it be that an activity or something has been deleted somehow? thanks!

Your are using KDE4??

Looks like plasma-desktop did not start.

Ctrl+Esc should give you a window with all processes currently running.
Search for plasma-desktop.

You can also try Alt+F2, type ‘plasma-desktop’ (without ‘’) and press enter
to start the process.