Digital camera monitor

Yeah it could be that! But you can also try putting the usb on it and unplugging out of the computer the right way. Cause I usually forget to exit out, and just take the usb out, thats why my cameras screen went black then when i connected it to the computer took a pic and unplugged it the right way i was able to see the screen again..

Take a picture. If the pictures also come out distorted then this sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check the following two links for more info:

http://camerarepair.blogspot.com/2007/11/canon-digital-cameras-showing-black.html

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819

Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/300/400/430/500, IXY Digital 200a/300a/400/450/500