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I had a similar problem, but I got a picture before it broke up and went off. The screen was backlit, but no video (screen was receiving some power).
The LCD needs a very stable voltage to work, this is provided through the LCD connector ribbon. In my case the ribbon was damaged and replaced it.
I have had no problem since.
I discovered this through trial and error; I first changed my transformer power supply and then the video inverter card.
You may find the link below helpful as it contains articles that photographically show you how to open the laptop for repairs.
The Display button manually turns the LCD display on or off to save batteries. If you accidentally had turned the LCD off, It should only take one press of the button to turn it back on and leave it that way. As such, it's not you but the camera. The A570 IS is relatively new. Your camera is likely still under warranty. If so, contact Canon for warranty repair (see the following link):
This is a common problem with S1 IS and it is caused by faulty CCD sensor. Note that you can playback captured images without any problem but in capture mode all you get is blank screen.
Will have to go to Canon but note that Canon repairs these models free of charge when it is the CCD sensor that stops working.
If you can playback captured images ok but in capture mode your screen goes blank and taken shots are black then the CCD sensor in your camera is faulty and has to be replaced. Nikon agent -if you can find one- will do this for you but it may be uneconomical repair on this entry level model.