My Canon all in one color printer model PIXMA MP780 won't turn on

Not normally but the black print head nozzles maybe blocked.
Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer than replace the print head.

The print heads are probably clogged: try running a few 'cleaning' cycles (with genuine Canon cartridges preferably).

Hi,

I will suggest you reset your canon printer, Follow this steps to reset your canon printer.

1. Turn off printer.
2. retaining button Resume/Cancel press button POWER - indicator it will catch fire by green color.
3. let go button Resume/Cancel, continuing to retain POWER.
4. press button Resume/Cancel of 2 times, retaining POWER, after which let go all buttons.
5. when indicator will be lit BY GREEN - press button Resume/Cancel of 4 times.
6. turn off printer by button POWER. Power on later to see what happens. let me know if additional information is required.

clean the head of the ink. then do the calibration for canon.

I just bit the bullet and went out and bought Canon ink and replaced all my other Print Pal ink cartriges and my printer works like a charm again.

DONT HAVE CD FOR INSTAL THE PRINTER C4480

Normal 0 Could have a corrupt driver.
Disconnect the printer or at least be sure it is turned off. I'd do both and when the CD software program asks you to connect the printer to the USB port, do so and it should again work properly.
Hope this helps. Bud

Try realigning the cartridges

when they say TONER , its refering to the INK CARTRIDGES , Color & black ,
CANON PIXMA MP780 & MP750 uses the same INK CARTRIDGES :
BCI-3eBK for BLACK & BC-31C for color

please rate this solution , hope this helps

Not knowing where you are from, I can only give the following help.

Do a Google search using the following text:

pixma mp780 +driver

Note the "+driver" (no space between the "+" and the word "driver").

This will bring up a lot of sites where you can dowload the drivers.