I need a new printhead for a canon pixma mp 760

That means the printhead is defective, and you need a new one. If it is under warranty, Canon will replace it, otherwise a new one is around $65.00

how did you fix this problem?

If you did put in a new printhead, it means you need a new purge, or cleaning assembly. If it doesn't clean and prime the printhead properly, it won't print.

You may need a new printhead now, or you may have left a foam packing block inside the new purge unit.

Drivers won't help, you need a new printhead,
# QY6-0049-000 around $60.00

That error is about the printhead when the printhead goes bad, you need QY6-0054-000, around $40.00, a new printhead.

Usually I see that when you put in photo magenta when it should be plain magenta.Otherwise you need a new printhead.

The printhead is clogged.

See the following guide:

Canon iP3000/4000/5000 Printhead Cleaning Guide

If it does not work, replace the printhead: Genuine Canon Print Heads

gonna need to do a nozzle check pattern printout should do that about 3x and should work

if not.
The printhead nozzles may be clogged.
The printhead may need to be replaced


so might have to do a print head cleaning as well. ushally found on the matinence menu on your unit.

i think there is problum in ur cartridge cas adoptor , clean cartridge circuit plate and put cartridge then try