Padlock icon appears - open and closed

  KNICK 10:35 14 Jan 2011
Locked

Hi, Recently a blue square with a padlock in it appears in the centre of my screen - alternating open and closed positions. I can click on it or move it and it is a great concern. Also a menu box keeps appearing with 'Dell Main Menu' as its title. I can't access this either to close or move. Can anyone explain or help please?
thanks very much

  Fruit Bat /\0/\ 10:37 14 Jan 2011
  woodchip 10:40 14 Jan 2011
  woodchip 10:42 14 Jan 2011

too slow

  KNICK 10:44 14 Jan 2011

No - so fast! thanks v much will give that a go.

  KNICK 09:43 21 Jan 2011

Alas, this fix has not worked - i've done it before and after and inbetween restarting. It doesn't always ask me to OK the change - perhaps this is the difference. Is there any hope at all or should I dump the monitor - it's too old for Dell to take any interest.
thanks

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