Display problem Canon MP520 printer

[HAKAN]

I bought a little over a year a CANON MP520 multifunction printer. yesterday seems it to sending a print request while it was a photocopy, the little screen for checking the printer does nothing. Sometimes when the power is turned on, it is very pale in the diagram which should be present then it fades away as if he were very tired. ' '
-> We can no longer be used as photocopier.
As against it continues to work perfectly as a printer.

Tests:
reboot the PC, connection and disconnection of electrical equipment etc. ..
reinstall drivers. All without success.

Can someone know solution for this ?

[MATSU]

Having never had to deal with this model of printer, is there any a button to "reset" or something like that in order to put the printer in the same condition as it leaves the factory? If this button is trying to reset your printer and to complete re installation

[HAKAN]

No there is no reset button and I found nothing in the doc. Accuracy is the white screen (backlight?) -