When I start up printer after it rotates the toner cartridges the error light comes on and cannot be cleared . On my Windows computer it says there is no cyan toner cartridge. There is, of course.

SOURCE: toner problems

A couple of suggestions. 1. make sure there is not any plastic shipping tabs that need to be removed from the cartridge. 2. try reseating the cartridge. 3. Try replacing that cyan cartridge. It may be defective. Also make sure you use Minolta brand toners!

SOURCE: Sensor Error

About the croaking noise:
The drum unit, underneat the toner cartridge, at the left side (seeing the machine from the front) has a kind of a pump device, made with an internal small belt (you can't disassembly it), its function is to move the old used toner, that exit the cartridge from the left hole, into the springed plunger, the toner moves into that chamber and is pumped back into the cartridge. In time that chamber receives so much old toner that the small transporter belt inside can't move anymore, it makes a very high load to the pulleys and they jump tooth, so the noise. You may want to disassembly the drum unit, (as reference the yellow p/n is 42126601), and get isolated just that chamber, there is only one small plastic geat that moves the pump inside. The gear must rotate somehow free, if not, try to such old toner using a vacuum cleaner, but you will need to keep rotating the gear by hand to pull out all the bad toner. It may exit from the bottom hole or from the spring loaded plunger on top (when pulling the spring). If you are lucky you may have it working back again, if not, prepare your dollars bills to replace the unit. The croaking you are listening may be cause by this or it may be a wrong drum unit you installed into the machine. Check the gears between the old and new units. Good luck. Wagner.

SOURCE: Rotate Toner Button and Replace Cartridge Messages

Hello
take out all toners and pc drum, use pressure air to clean chip reader under the toner rack (right side) also use some alcohol to clean chips on toners and reinstall.

SOURCE: changing toner cartridges

Go to reset menu on printer LCD Panel
Hit enter button
Scroll down until you get to the "Change Toner M/C/Y/K" hitting the enter key when you get the appropriate letter.
This will rotate the appropriate cartridge to the opening!

SOURCE: Toner Not Installed - After replace black

pleas clean toner chip reader, remove pc drum and all toners, under the toner rack there is a 3 pin chip reader, use pressure air to clean it. if the new BK toner is not original, it will say only not genuine toner but will print.