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Both cartridge do NOT work????

I did some test: it's black only and it is NOT the cartdrige. So it is printhead. What should I try first? Wet cleaning or compressed air? And how? I do not want to damage printhead. I am sure somebody already posted some hits, but I cannot find them. Do you have a link to posts?

Can you please add a link to any post explaining which home-made solution I can use? My understanding is that most special chemicals are just expensive version of stuff that can be found in any supermarket, in home-cleaning products shelves.

OEM Canon black carts, high quality. They always performed well. I have not tried yet cleaning. I was told I have to use a mix of water and ammoniaca (50%). Any hint?

Well, replacing the printhead is not a solution, in my opinion. The printer is only two years old, and normally used. If Canon printers are so weak, maybe I can look for an alternative.

Well, yes, i550 has a big black tank and three small color tanks. I tried three different black tanks, so it is NOT the cartdrige. I cleaned the head deeply several times, so it is not a clogged printhead. If it is some electrical problem I am in a mess, ain't I?

No, I did several tests: it *is* black. Printer works fine with ANY kind of paper selected BUT the standard one. Of course I am speaking of paper selected in teh option: does not matter which physical paper I really use. So, tehre is a problem in the options, probably in registry, or in printer...

Since yesterday my Canon i550 stopped printing black. It can print in color but not in black. However it could print gray, so I suspected a driver or Windows XP problem rather that simply dirty heads. So I did some test and... wow: it can prnt black if I select any paper type BUT plain common...