“Do u have to replace all cartrages or 1 just the black if the black runs out”
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the Best Buy specs on this page seem to say that you MUST have 2 cartridges inserted in order for the unit to function. (Specs tab, "Number of cartridges required: 2") but i pulled up the User's Guide on HP's website, and that says you do NOT have to have both inserted. also, maybe more to the question--Norma, you can just replace the black cartridge if the tri-color cartridge still has ink in it. you can buy, i'm pretty sure, a single black cartridge, although buying a 2-pack of BLACK cartridges might be more cost-effective. btw, since this printer apparently DOES allow for only 1 cartridge to be inserted, i was told (long ago) that if you don't print with color very often, you should remove the color cartridge and store it in an air-tight bag (e.g., ziplock or baggie). that will keep the ink from both drying out or evaporating. when you want to print in color, just insert the cartridge.
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Sorry, there was a problem. Please try again later.This HP Printer supports single-cartridge mode. To use the single-cartridge mode to operate the HP Deskjet 2540 series with only one ink cartridge. The single-cartridge mode is initiated when an ink cartridge is removed from the ink cartridge carriage. During single-cartridge mode, the printer can copy documents, copy photos, and print jobs from the computer. To exit single-cartridge mode Install both the black and tri-color ink cartridges in the HP Deskjet 2540 series to exit singlecartridge mode.
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