Several things, and I have a HP Deskjet 5550, but similar should apply:
1: put the ink exit jet area under water for maybe several hours, might 
try adding some soap and/or alcohol to dissolve dried ink at the 
openings. Try not to submerge electronics. An ultrasonic cleaner might 
do the job.
2: Some of the refill kits include a little cup for the end of the 
syringe to apply a vacuum to the jets which sometimes will get it working.
3: Refill the cartridge,  maybe it was low to begin with, and dried out.
4: Buy a new cartridge. (50% chance)

Depends how much your time is worth, if on tight budget, spend more 
hours fixing, if work has been good, just go buy a new cartridge. Best 
to refill before runs out of ink.


Tamas Rudnai wrote:
> Hi,
>
> I have a Dell AIO 950 and I did not use that printer for a year.
> Yesterday I wanted to print something and realised that the black ink
> does not work. I think it could have been dried out? Is there any way
> to get it back, or should not bother just buy a new cartridge? (but
> then I won't use that again for a year so dunno what to do with an
> inkjet if that happens every often...) Any advise?
>
> Thanks
> Tamas
>   
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