   windows xp log off results in blank screen sometimes
  I am using Windows XP with Service Pack 1, all the latest patches, and have fast user switching enabled. Sometimes when I log off, I get a blank screen instead of the Welcome screen with the usernames. It appears to happen more frequently the longer I use the computer, and is a bit hard to reproduce.My keyboard becomes unresponsive, for example, pressing either Num Lock, Caps Lock, or Scroll Lock does not change the corresponding indicator light. I don''t know if my mouse is still working because I can''t see anything; the screen is completely black. Hooking up a USB device to the computer seems to do something because hard drive activity followed. I can also ping the computer from another computer, and plan on trying to remotely shut it down someday when I figure out how to do it.I''ve found only one other post by someone who''s having what appears to be the exact same problem. My brother just got this problem a couple days ago, and his hardware set up is completely different from mine. His computer is a couple years old, while mine is a couple weeks old.I think the computer is still running fine, but video output goes awaway and the keyboard stops working (possibly the mouse). I''m guessing it''s a software problem, and as of right now, the only culprit I can think of is Daemon Tools. Aside from that, I don''t think my computer and my brother''s has any software in common, although I''d have to check on that.Has anyone had this problem before? It''s annoying the hell out of me, especially since Windows gives no indication of exactly what happened. 
  Intall Lin.... ahhh forget it.  I have nothing helpful to add.Sometimes printer drivers can stuff things up like that. ;  I have no printer installed, and neither does my brother. Ugh, I hate hard-to-reproduce problems. I think I might uninstall Daemon Tools for a while to see if it helps. 