Here is what Canon says.
Solutions for blank LCD
Issue: The Liquid Crystal Display (LCD) is blank or displays distorted colors or spots / stripes
1.
Disconnect and Reconnect AC power adapter or power cord to the device and electrical source
2.
Disconnect and reconnect the electrical cord to ensure a secure connection
3.
Press the ON/OFF button to power on the multifunction device
4.
Try a different electrical source / outlet
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gee canon are helpfull, didn't fix my problem either
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