I'm trying to install a new toner cartridge into

most toners have a wing or *** or? that contacts a sensor in some way when the lid closes to tell the machine a toner is present. ive had these pieces broken off on new toner or the toner sensor may be disloged from its seat. check around the perimiter of the lid to find the sensor then see if anything is present to trip the sensor. if its broken off stick a q-tip in the sensor that will get you printing til you can replace the part