Install print Cartridge

[martinz]

Since yesterday I am getting a message on my HP Laserjet 1012 that I should install print cartridge. I cant print anything! There is no paper jam. All doors are closed. I checked everything over and over. I don't know what to do? Any suggestions?

Thanks,

[MichaelTech]

Third party toner? Try pushing the continue button. Toner could have gone bad or is empty.

[theengel]

Install a new print cartridge.