Mrs Duck, you are not the first and you certainly won't be that last to make that discovery. It is easily done.

Thinking of things like that, when I worked at Hotpoint and I got a phone call reporting a dead terminal, my first question was "You have checked that it is plugged in and switched on?". You would be surprised at the number of intelligent people who can miss the most obvious things (and although I hate to admit it, I am one of them - not too sure about the inteligent though).

See you in Hearme sometime.

Jon