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What toner cartridge did you put into the printer?
Check that the protective tape was removed from it... if that tape is still on, the toner cannot dispense from the cartridge, leading to blank pages.
What was the defect in the old cartridge, please? it might matter to this problem.
If this is a color laser printer, and you only put in one color of new toner, are you printing in only that one color? i.e. if you are printing in black, you know, that color's new cartridge being either tape-protected, or itself defective in a different way, could result in blank printouts of text, in black ink only.
Try a full-color print, just a small image in full color or the like so as not to waste ink.
If that still comes out OK, except maybe for what black-ink content it might have, then you just have a problem with the black color.
Or try a full-color copy (but a small one, to save ink.) See if the color at least comes out, if not the black.
If you changed out only one color, of color (not black) cartridge, then if that caused the machine to stop putting *anything* on the page, take that cartridge out again, and put in the other cartridge, even if it had a problem... after turning the machine Off for 10 minutes, and closing its doors meanwhile. See if that at least gets it printing (albeit defectively) again.
Let me know more details about what color you changed out, and how full-color tests, printing or photocopying, come out. I'll advise you further as needed.
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