I had this problem too and I discovered that there is a sort of switch in the display lid that malfunctions. It is probably there to switch off the display if you close the lid while the printer is on.
The solution is to open the lid just enough to reach the on/off switch and turn the printer on. If you now open the lid fully the display is up and running like you were used to.
SOURCE: The printer Canon MP520 home screen is grey and
Change the display cable
Solution an steps given here:
http://sites.google.com/site/bricolagesetc/home/my-experience-guide-repairing-pixma by Berurier
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