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Laptop screen blanks out TV screen at login

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Last Modified: 2012-05-12
Hello all,

I have a friend whose laptop runs health info messages on a TV screen in the lobby of her office.  They create the info in the laptop.  The laptop does not run the info on the TV screen, though, and is taken back to the setup room it normally occupies. The TV runs the info.

Now, the TV will see the bootup of XP through to the login screen, at which point it goes blank while still showing it is in PC mode in the upper right corner of the screen.  In the meantime, at the login screen, the laptop screen takes over the duties of video.

This is pretty much beyond me. I volunteered to check on it thinking the FN key was toggled, but it is not.  Since the TV goes blank at the login, I figured XP was stopping input to the TV screen at this point, so I disable the Firewall and removed the login password to check, but neither of those were causes.  This combination worked last week when they changed the messages on the TV screen successfully.  Any Ideas as to where to check next?  Would drivers just have quit working like that?  I ran Ccleaner, Ncleaner, Malwarebytes, and found the Dell Vostro to be pretty clean.  There were a number of Registry problems, all minor.  Didn't run Combofix or Sypbot.  

Thanks
royalm
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