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Start - in the search box type CMD - right click on "CMD" and select "run as admin". You will get a black screen with blinking cursor. Here you can type the printer command and hit "enter" on the keyboard to fix error. You can also visit WWW.techsupportall.com and from the top heading select " printer fixes" option under computer fix
If there is something wrong with the printer, you should get a error message describing the error.
Does the printer have a blinking orange light after you give the print command? Then there is an error in the printer. If you have documents in the print queue, delete them. Remove the printer cable. Shut the printer down, shut the computer down. Reconnect the cable and turn everything on again. If there is still a problem there might be something wrong with your printer.
If you don't have a blinking light after the print command on the printer, then try changing the printer cable. If not working, try another USB port. If still not working, reinstall the printer.
Set the maintenance counter:perform test command 72.Press C - interrupt key - 0 - interrupt key - 7 - 2 - PSW.The currently set maintenance cycle code is displayed and the ready lamp lights up.After the ready lamp lights up anter the set code corresponding to the maintenance cycle mode.0 = 10000 sheets ; 1= 15000 sheets ;2=30000 sheets.See the toner full detection part and remove the wastw box,change it.Perfor the test command 14.This command used to cancel troubles other then U1 and U2.After cancellation of trouble the test command is also cancelled automatically,also used to cancel toner full detection the maintenance lamp blinking.
The yellow blinking light is not reported in the code errors, take a look to service manual http://rapidshare.com/files/91114670/Canon_i550_i850_i950_Service_Manual.pdf.html (hard to find but I did it ! )
I had the same problem and I solve it sending the clean head command from the settings of the printer driver (win XP) I also reset the printer as it is explained in the service manual.