I put new ink cartridges in my hp 2575 about ~six months ago and hadn't used the printer since then. I tried to print and it goes through the motion of printing but nothing shows up on the page. The indicator for ink levels showed it as very high (which makes sense) but nothing is showing up.

I just had this exact problem on my HP 5514. Black won't print after running out of black ink. New cartridge no good.
I tried everything-no good. I suspected the pinholes in the printhead were clogged with dried ink because I didn't change cartridge in time.
The fix that worked perfectly was when I hacksaw top off old black cartridge & removed all foam wicks so now I had a funnel(can see clear thru). I installed the cartridge & filled it with alcohol, printed page & did head clean; then printed few more pages. Problem cleared almost immediately. I then soaked up extra alcohol inside cartridge with paper towel. Removed modified cartridge & installed good one. I guess this could be done for colors as well. I don't know if this is a proper procedure, but it sure worked well for me.

Yes - if they are not used they will dry up and be unusable.
Unfortunate but you need to replace them.
For future ref - IF they will not be used in 4 - 6 months
pop them out and put scotch tape on the head where ink comes out
and that should keep them good for several months..
I have done that and close to a year later - was fine.
Hope this helps :)

please check cartridges nose and clean for tissue paper and solve the problem

It's always good to do the machines automatic cleaning, and also manually cleaning the printheads with a damp lint free cloth. However, regarding the ink cartridges, you're better off just buying new ink since ink cartridges usually last just for six months.
And since it's been a year already it's close to impossible if you're gonna try to calibrate the cartridges still.

Try using a new HP ink cartridge. I had the same problem with a printer I purchased off of CraigsList even though the ink level was good. I installed a new color HP ink cartridge and it printed without a problem.

probably you just replaced th "ink" but what you really need to replace is the "PRINTHEADS"
Put new printheads and printer will print like new again.

It may be caused by some issues. Check:

* Did you remove the plastic from the connections from the cartridge as the instructions indicates?

* Is the cartridge connector from the printer ok?

* Is the cartridge correctly installed?

* It's a new cartridge? I mean, NEW. Not refilled one or a cartridge that expired two years ago.

* Try running one or two "Clean printer head" procedure to see if ink flows.

Good luck !

I've just installed two new print cartridges, and they have been aligned and it goes through the motions of printing, but no ink comes out. Is their a solutionto this? It was just working two days ago.

Thank you.

I'm experiencing the same problem. I tried to troubleshoot through software that came with printer, but no luck. Here's what happens:

The printer worked great for a month or so. Then, I didn't use it for a few months. When I tried to use it again, it acts like it's printing. My computer shows it's printing, the printer runs through all the steps, including moving the print cartridges back and forth over the paper as it should, but no ink comes out on paper.

Any suggestions?