Canon MX712 not starting up

I have been reading the posts about Canon printer problems not turning on and I am having problems getting to the power unit in my Canon MX710 printer can anyone instruct me how to get this unit apart to try the fix I read about?
 
Hi I posted a question a couple of days ago but gave the wrong model number . My unit is a Canon Pixma MX712,( not a 710). It was working fine and I just bought a new ink package (of course) we went to turn the printer on and it wouldn't turn on. I read some posts on this website about disconnecting the wiring from the power supply and reconnecting it so I've been trying to get the power supply out but I am having trouble getting the printer apart without destroying it. Has anyone out there done this fix before that can give me some instructions on how to get this unit apart to try the ( fix ) on it?
 
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