Hi all.  I'm a newbie.  Please help.  Upon turning the computer on, the ctrl, alt, delete screen pops up, the the logon screen.  After logon, a blank blue screen is all that comes up on the computer.  No taskbar, start button, or even icons.  Prior to the ctrl, alt delete screen, I didn't see any boot up info on the screen.  Any ideas?  Thank you in advance.  Any help is greatly appreciated.