Hp color laserjet cp1518ni color does not align???

Question

I recently posted at the beginning of the month saying I was having problems with my hp color laserjet cp1518ni and the whole left side printing blurry.  After cleaning the rollers, running it through the cleaning mode, restoring the defaults and calibrating the colors, it miraculously worked.   
But less than a month into the fix and I am once again having problems.  I have done all of the following (I have windows vista 64bit):
*updated firmware and confirmed that it is updated to most current version 20120110
*restarted computer
*turned off printer - more than once
*disconnected printer - more than once
*restored defaults - more than once
*calibrated color - more than once
*run it through the cleaning mode - more than once
I have taken each toner cartridge out and carefully placed them back in again making sure they were firmly in place.
My husband has tried connecting it to his computer and printing it, but has gotten the same results. 
I was trying to print out a job when I noticed that the color was horribly off from what was on my computer screen.  Since I was 5 prints away from needing to change the cyan cartridge, I changed it, thinking this would fix the color.  Not only did it not fix the color, but that's when the alignment problems started happening.  I am so completely frustrated.  It is ridiculous to have this kind of problems with a printer every time you try to print and I've spent the last 3 hours fighting with it.
I am absolutely, without a doubt, certain it is the printer.  I don't know what it is, with the printer, so if anyone has any advice, I would greatly appreciate it.  I just opened a 3 pack of toner (to put the cyan in) so now not only can I not use the printer, but I am out money for the other 2 toners.
The reason I know it is the printer, is because I finally I printed the same exact piece I had been printing on the hp color laserjet cp1518ni that looked horrible in both color and color alignment, onto a Canon MG6120 inkjet.  The color was exactly as it appeared on my computer screen and there were no problems with misalignment.  I just prefer to do my jobs on laserjet printing, so this is frustrating to have a large, expensive doorstop in my computer room.
Any help is much appreciated.

Answer 1

I wanted to add one more thing, as I was looking through the Resolving Print Quality Issues page
http://h10025.www1.hp.com/ewfrf/wc/document?docnam​e=c01691481&tmp_task=solveCategory&cc=us&dlc=en&lc​...
I have printed out a Diagnostics Report and it's obvious that there is a problem. Under Solution #11, it tells you how to
Identify and replace the problem print cartridge
Because it allows you to print and see:
The page prints five bands of color, which are divided into four overlapping sections. By examining each section, you can isolate the problem to a particular print cartridge.
I have done a search on my computer for:
HP Color LaserJet CP1510 Series ToolboxFX and it does not come up. I am able to do everything through the printer itself (run the cleaning mode, etc), but as far as finding anything on my computer under a folder, there doesn't appear to be anything.
I'd like to be able to print out these pages so that I can see which colors are giving me problems. Is there a way to do that from the printer?
Thank you!