Shadow on Imac 20" screen

Hi
This happened about a year ago, but then stopped, but has start again recently. Intermittently, often, but not always, after it goes to sleep, or when turned on, there is a shadow on the screen that starts at the top, and gradually fades towards the bottom.
It will stay there the entire time the screen is active. Sometimes it will go away after it sleeps, or is turned off, but seemingly randomly.
Any one else have this problem?
Thanks
Glenn

Hi gdwgdw
Exactly which iMac?
If it's a Glossy Screen Aluminum, it may be condensation on the inside of the front glass panel.
Dennis

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