Blinking Lights My Pixma iP4000 on/off button light is blinking: one long green, five short ambers, one long green, five short ambers. . . can you tell me what is wrong and how to fix it?

This didn't work for me but maybe it will for you. I had the exact same problem. The 5 amber lights indicates a problem with the print head. If you take out all of the cartridges, you can easily pop out the printhead, just slips right out. take some alcohol(rubbing, Not Jack Daniels) and cue-tips and clean the heck out of the contacts on the bottom of the printhead.
Good luck.
DC

Do this to reset your printer:

1. With the printer plugged in and powered off, press and hold the Resume/Cancel button, then press and hold the Power button. Do not release the buttons. The LED light should be green to indicate that a function is selectable
2. While holding the Power button, release the Resume/Cancel button, do not release the Power button
3. While holding the Power button, press the Resume/Cancel button 2 times, and then release both the Power and Resume/Cancel buttons. Each time the Resume/Cancel button is pressed, the LED lights alternately in orange and green, starting with orange.
4. When the LED light is green, press the Resume/Cancel button 4 times. Each time the Resume/Cancel button is pressed, the LED lights alternately in orange and green, starting with orange.
5. Press the Power button. The LED lights in green, and the reset is performed. When the operation completes, the printer returns to the menu selection mode automatically
6. Press the power button to exit service mode.