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Forget buying a new toner cartridge and don't bother re-installing anything - This is a power supply problem - The electrolytic capacitors fade away after a few years of power on and the high voltage to the printing engine drops too low.I tried a new toner cartridge - no help - re-installed drivers - no help.If you can handle a soldering iron or know a friend who can, replace the following capacitors on the power supply board on the LHS (power cord side). Make sure you use low impedance 105 degree power supply types. Warning - high voltage !!! power cord out and wait 30 minutes before touching anything. C374 341 503 529 (47uF/35V), C526 (1uf/50V), C506 (0.47uF/35V), C515 (100uf/50V). All the others tested fine in mine. Also make sure you install them the correct way around! Now I have "black as black can be" prints just like new and I can set print density back to 2 not 5. enjoy ;-)
Check out if you've installed it correctly. Also check out other ink cartridges, are they empty? If yes you won't be able to print anything. However, if all ink cartridges are OK then try to reset the printer or reinstall the drivers. You can find help in MFC 495cw users manual
I have the same problem with my magenta. I've installed a new cartridge and it just keeps telling me it's out. For awhile it was allowing me to print in black only, but now it just won't do anything. HELP!