My MC light ( amber color is flashing on my HP Officejet Pro K550 ? What does this mean? Will not print anything. Green light is also flashing.

Martin Smallridge

• 419 Answers
• Posted on Jan 24, 2009

SOURCE: hp officejet pro k5400 will

1. Printheads have an expiry date so I'd recommend checking that the printhead has not past its expiry or something similar. It's a shot in the dark but may be relevant.

2. It's also possible that the connecting strip at the back of the printheads slot is soiled with ink or condensation... Try using a cotton bud to gently clean this strip of any moisture, wipe the contact on the printhead too (NOT the printhead nozzles!) and then reinsert the printhead.

As Rowdytown points out though, pulling the power on this printer and then reinserting after a couple of minutes usually resolves any internal issues as well by hard resetting the printers state.

wings_it

• 141 Answers
• Posted on Jan 23, 2010

SOURCE: Hp officejet k550 wont print black ink

I guess you tried a new cartridge with the same problem.. so try to run the utility tools from the HP soft, you can download it here :
http://h10025.www1.hp.com/ewfrf/wc/product?product=501369&lc=en&cc=us&dlc=en&submit.y=7&submit.x=11&lang=en&cc=us
It has also a "Solve a problem" section who might help you.
Then if the problem remain check the contacts in the printer, sometimes ink goes in, dry and stop the contact. Clean it with a hear tip and water (disconnect power and allow to dry before testing)...
Good luck and don't forget to rate.
Cheers

SOURCE: My HP Officejet pro K550

This is normal for this model of HP printer when the ink has 'expired'.
Normally it will print one line from the print head, then check to see if the ink is okay before pumping more ink into the printhead. If it has expired then it pauses in the middle of printing to give the user an opportunity to replace the ink cartridge with a new one, highlight which cartridge needs replacing by lighting and indicator over the 'bad' cartridge.

There are three solutions for this:

1. Buy a new HP Ink cartridge;
   expensive and innefficient, but it will ensure the highest level of quality and continued warranty for your HP printer. And is the least likely to cause problems.
   
   
2. Buy a third-party "refillable" ink cartridge, or MOD chip;
   Less expensive, but still wastes what remaining ink you have in that ink cartridge. Voids the warranty for your HP printer and can lead to a print head clog.
   
   
3. Set your system clock and print like it's 1999;
   Silly printer driver reads the system time to determine if it has expired; will cause the printer log to be inaccurate, and cause problems with software updates, security certificates and other time-sensitive applications. May requirie shutting down both PC and printer simultaneously to be effective.
   
   
4. Crack/Patch or replace the printer driver to remove expiry;
   3rd party replacement drivers are unable to match the resolution of HP's original drivers because they don't know HP's secret PCL codes. Cracking/Patching HP drivers may be illegal depending on where you live and what security clearance you have. It may also possibly sometimes break features like document control and printer logging.
   
   
5. Buy another printer
   Expensive and wasteful.
   

SOURCE: HP Officejet K550--2 lights (KY & MC)are

Open the back of your printer and remove the paper jammed on it