My Ricoh Aficio MP 161 said to add toner but still won't copy

Check your old toner bottle and make sure the plastic "cap" is still in the bottle. These machines have an occaisional problem with the caps coming off (not the black screw off cap but the semi clear cap under the black screw off cap) and staying inside the black plastic "cup" that you insert the toner into. If the cap is missing it may be stuck inside this cup. If the cap is still in your old cartridge then try opening/closing the front door and letting the machine cycle to see if the toner light goes out. May have to do this several times. Had one customer just yesrday have to do this to clear the toner light after adding toner.
Good Luck.