My canon mp730 says wrong cartridge i called canon they told me to take out ink and the cartridge holder to reset it then put ink in same problem did not work dont know what to do

It could be due to "waste tank full" alarm; you may need to reset the waste tank counter.
I found a reset sequence for a MP730 printer in this website that works for F30 and F50 as well. Try:
Resetting the Waste Ink Volume Counter

1) Enter SERVICE MODE.---
By pressing Menu-Copy-#

2) Select TEST MODE.
3) Select [8] PRINTER TEST in TEST MODE.
4) Select 3. [EEPROM CLEAR].
5) Select 0. [INK COUNT].
6) Press the [OK] key.
7) Press the [Stop/Reset] key (returning to the state of 3)), and then press the [ON/OFF] key.

Skip step (6) since there is no [OK] key on F30 or F50 printers.

Many times , if we use refilled ink cartridge , then also we might get such error messages on the printer display .
Ensure that you are using genuine Canon ink cartridges.. but if the error is after changing to a new set of genuine ink cartridges..
try by cleaning the electrical contacts of both ink cartridge and the printer.. and also do a semi full reset..

see canon mp150 solved error e5.

Your print head may be damaged. You might consider replacing it.

Canon suggests pulling the ink wells and also pulling the print head and then reinstalling the whole assembly. They consider this a reset. It is also suggested to replace the printhead which the ink cartridges are housed in. I have done this to remedy bad printing and am considering this $50 purchase as I am dealing with "wrong cartridge" message also. Some have said replacing the printhead remedied this code problem. BUT, i did read one person who said this did NOT work. Right now I am debating whether I should put $50 dollars more into this machine....although this printer has been excellent and many agree.
Comments: Apr 17, 2010 - As a follow up I did fix my "Wrong Cartridge" message by replacing the printhead, I worked and worked at cleaning the old one but finally gave in and anted up the $50. This fixed it! Long live DIYers!

Hi there
Ok I have put a MP-Tools in my website for you to try out this tools are for reseting your inks plus it can do much more.

Click Link = http://www.4all2sell.com/reset-tools/MPTool.exe

All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

All files on my website are only there for a limited

It's worth repairing, That error on a Canon is saying that the printhead is bad, not your cartridges. The part number for your printhead is stamped on the side of the printhead could be QY6-0049-000 but I'm not sure.

That message means that you need a new printhead, the holder where your inks go. the part number is QY6-0064-000 around $40.00. easy to change yourself, instructions are included.

Hi there

Ok I have put a MP-Tools in my website for you to try out this tools are for reseting your inks plus it can do much more.

Click on the link to download it.

Click Link = http://www.4all2sell.com/reset-tools/MPTool.exe

All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

All files on my website are only there for a limited time

replace print head. print head is bad.

Warning: This can be messy. Covering your counter or table and wearing thow away plastic gloves is strongly recommended. Take all the ink cartridges out. Wipe the rims of the ink ports and seal with tape or peel & stick label, to stop them from drying out and set aside. Flip up the plastic lever on the right side of the ink cartridge holder box. This will release the hold down mechanism that keeps the print head in solid contact with the electrical contacts at the back of the ink cartridge holder. Gently lift out the actual print head. You may have to gently use a straightened out paper clip to rock it out so you can get it with your fingers. Get a small plastic tub (cottage cheese or yogourt container) etc., and soak it in rubbing alcohol for an hour or two. Put enough over it to also soak the ink screens on the other side from the printing part of the head. Clean gently with a Q-tip and alcohol. Inspect the bottom side with a magnifying glass if available, and get any dried ink off. Change the alcohol and do this again until all ink is gone. Finally, shake the alcohol out over a newspaper (watch, i'ts messy) and leave overnight to dry. Clean the gold dots with alcohol just before you put it back in. It is important not to touch the gold or the actual printing part of the print head. Put it all back together and run a few head cleanings thin a nozzle check. If the problem persists, call Canon and order a new print head. Approx. $60-70. Good luck.