Canon Pixma iP2000 wont print black ink?

INK PROBLEM
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.

You may need a newer cartridge
See if the printhead has any abnomal markings.
You can compare it with the color printhead.
If the printhead is good, see if the ink is flowing through the printhead.
Fill the ink cartridge to maximum
Squeeze the sides of the ink cartridge, ink should flow out.
If ink is flowing out, remove any excessive ink with a paper towel.
Install ink cartridges, do NOT do any cleaning cycle.
Since your black cartridge is full, cleaning may cause it not to print.
Do some black copy operations.

I have to ask this question of you, just to make sure this is not an issue. Are you using a factory new ink cartridge?
Please consider the following:
If you are using a refilled or third party cartridge that may well be your problem. Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges.
They do this to prevent problems from contaminated inks causing problems with print quality or damaging the physical printhead.
If you are using factory new cartridges, then please call the manufacturers Technical Support for assistance with the warranty on the cartridges
Don

Remove ink cartridges,then print head.
Clean print head with dry cue tips.
Apply strong suction over black print
jets on print head.
Replace print head and cartridges.
It worked for me.

Sounds like you need a new printhead.
QY6-0054-000. around $40.00

as i can suggest you that it can be the problem of head clogged internally where you insert your black cartridge .and the other main cause is while you give a head cleaning command to get the cartridge cleaned it sucks or pulls  the ink from the cartridge in such a huge quantity that 3-4 cleanings make the cartridge totally empty .due to this the ink gets very low and the printouts come with streaks.many a times setting the print mode in best makes the copy perfect.but the printing gets too slow in that best mode.

replace the printer head....

Have you tried cleaning the ink pads on the print head using a can of compressed air and blowing from the inside outwards, taking the print head off first. You can usually buy a tin of compressed air in somewhere like PC world.

try cleaning the print head as follows, otherwise a new print head.
OK, Canon will hate me for posting this.

1. Remove ink cartridges
2. Remove print head
3. go to sink or tub (stainless steel, not plastic type), pick up a roll of paper towel on the way.
4. Fold several layers of paper towel and place on flat surface.
5. Run hot water until HOT!
6. Turn hot water back to a dribble.
7. Run the dribbling hot water through print head, be careful not to wet the gold contacts.
8.When water running through print head is clear, place print head on paper towel.
9. Repeat number 7 and 8 until no colour shows on paper towel.
10. Gently DAB print head (DO NOT WIPE) inside and out with dry paper towel until dry.
11. I normally replace print head after drying, but you may wish to let it air dry overnight.
12. Replace print head in printer and install cartridges
13. Start printing.

I do this to all 4 of my Canon printers every 6 months or so.

If any colour fails to print after this process it means your print head probably needs replacing.

1. Manually adjust color from the driver (Mac OS 9) 2. Manually adjust color from the driver (Mac OS X) 3. Manually adjust color from the driver (Windows) 4. Confirm that the recommended ink tanks are installed properly (iP1500 / iP2000) 5. Disable Monochrome Effects in the printer driver (Windows) 6. Perform print head alignment (Mac OS 9) iP1500 / iP2000 7. Perform print head alignment (Mac OS X) iP1500 / iP2000 8. Perform print head alignment (Windows) iP1500 / iP2000 9. Perform print head cleaning (Mac OS 9) iP1500 / iP2000 10. Perform print head cleaning (Mac OS X) iP1500 / iP2000

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=257&modelid=10236