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Laptop display and external monitor flash on/off continuously like an old neon sign RRS feed

  • General discussion

  • I have a Dell M4400 running Vista Ultimate with a Dell External monitor hooked up through the dock.  The problem occurs when I log back into the system after it has been locked (Win L) keystroke.  As the display comes back up on the laptop display, the external monitor starts to pull up its secondary display... both display start to turn on and off about every 1-2 seconds.  This will continue until the system is logged off or restarted.  A Dell technician has already replaced the motherboard and I have already taken the dock out of the equation.  The monitor was hooked up with a DVI cable from the dock, and now with the standard VGA going to the laptop.  The problem still persists and ONLY occurs after logging back into after being locked.  The problem does not happen in Safe mode and does not happen when the external monitor is disconnected.  Any Ideas???
    Friday, June 5, 2009 3:01 PM