HP DeskJet 5550 InkJet Printer "kid ink" Questions

...I have lots of ink for this printer -- it is used at a community center by middle school kids. thanks for answering this request for information Dennis dear ok_ME_3, i have the 2610xi ...

...The printer acts like it's printing, but the pages come out blank. I do have 2 pre-school aged kids which occasionally get into things....could they have done something to cause this or is the ...

...ink sales, which is really where they make their money from. (sorta like razors and razor blades, they'll give you a free razor and make all their money/profit on the blades as the comsumable item) ...

...put it in the warm, soapy water for 20-30 min than take it out and trow it in the trash. :-) Just kidding... To clean the printer head, remove the ink cartridge from the printer. Moisten a cotton ...

...all black printing selected. (I had set that a while ago when my black cartidge ran out when the kids had a paper due - I forgot I had reset it. Once my color cartidge ran low, everything printed ...

kid and now I'm almost out of magenta ink but the rest of the cartridges are untouched. These were the only pix I printed so far but I may need some advice on if tyhis is typical after only 2 pictures

from Fax, changed toner cartridge and all works fine, it's like when it's says it need ink it's not kidding

...I have unplugged it and everything. What do I do??? Preschool in the morning and cannot print the kids work :( well, you need to get NEW cartridges because there is a NON-resetable ink level

Even with a new ink cartridge, the printer thinks there is no ink I wondered why my kids kept asking me to buy new ink cartridges, even though they did not seem to be printing that much.  Even ...

...print in color & the cartridge is OK My A920 printer will not print in color only black & white. My kids may have changed it to print in black only but I am not sure. Please tell me how to change for ...