Dark LCD display on Caon S5IS

I have a Canon Power shot S5IS. Owned for years and LOVE it. Never any problems. Was going to take a pic of my painting yesterday and when I press 1/2 way the LCD goes very dark and the photo taken is dark. It has never been like that before...I may have inadvertently pressed some button without knowing. Cannot view thru the lens viewer because of my glasses. Cannot use the flash because it reflects of the painting surface... I just want it back were it was...Auto, point and shoot, even in low light it never had a dark LCD . I've read the manual but cannot find or fix the problem.Can anyone help? I have changed the batteries. Thanks for any help. Sheldon Grimshaw edited by moderator: deleted email for safety reasons

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