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PIXMA MX490 prints lower half of first page blurry, other pages OK


Need printer support but website won't let me register--it is rejecting my Serial Number as invalid

I have a PIxma Mx490 with lots of problems. Today I printed a document and it printed the bottom half of the first page blurry, although other pages look fine. I thought maybe this was a driver problem, so tried to update the driver, but got an installation error. I went to Canon website looking for support, but had to register my printer. When I tried to register, it told me the Serial Number--which is printed on a sticker on the back of the printer--was invalid. So it won't let me register. So I can't get support. So I can't print my document which I need for my business. 

Anyone else run into this? 

(And I haven't even gotten to the part where the scanner won't connect to my computer any more. And this printer is only about 2 years old!)