From the Canon Support Website
Issue:
The device does not power on
1.
Disconnect the power cord and wait at least 5 minutes
2.
Press the ON/OFF button to power on the multifunction device
3.
Disconnect and Reconnect power cord or AC power adapter to the device and electrical source
4.
Disconnect and reconnect the electrical cord to ensure a secure connection
5.
The MX700 may require repair
6.
Try a different electrical source / outlet
I absolutely NEVER post on these sites, but my canon mx 700 had a paper jam today and just SHUT DOWN on me. it took me two hours to figure out the solution
SOLUTION: Unplug the computer for five minutes. When you plug it back in, HOLD DOWN the power button on the printer BEFORE you plug it in. As you plug it in, keep holding down the power button.
I dont know why but that worked for me.
good luck.
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