I changed the toner cartridge and now it won't print. The red round light on the control panel is lit. Now what?

Don't fiddle with it you'll just mess with it more take it in and see what they can do if not i suggest you by a new one.

HI

Please remove your cartridge and check you remove the all security strip in cartridge.

I guess it FixYa didn't accept my (very long, but totally correct) solution that I took the time to type. Because I refused to "sign in".
Here's the short version. Load Paper. The same thing happened to me. I replaced the toner cartridge with a new one (because of a FLASHING red light for several weeks) after the red light went to STEADY red. But it still would not print. The paper was "out". When I'd refilled the paper-tray, it printed fine. I had just ASSUMED that the steady-red light meant toner was finally OUT. WRONG! That steady-red light had nothing-to-do with toner; it meant "you're out-of-paper". Don't get confused like I did. Refill the paper-tray. Then take that expensive NEW toner cartridge OUT, and put the OLD toner cartridge back in. And keep using the "dregs" of the toner out of the old cartridge for several more weeks. And DON'T get confused by the paper-is-out condition making that red light STEADY.

Hello , I believe I can help you out.

First here is a bit about your machines toner maintenance.

Second will be how to change the cartridge.

Remember if I was of assistance please be kind and leave a kind quick testimonial and good rating.
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Maintaining the toner cartridge
Toner cartridge storage
Toner cartridges contain components that are sensitive to
light, temperature, and humidity. Samsung suggests users
follow the recommendations to ensure the optimum
performance, highest quality, and longest life from your
new Samsung toner cartridge.
Store this cartridge in the same environment as the printer
it will be used in; this should be in controlled office
temperature and humidity conditions. The toner cartridge
should remain in its original, unopened package until
installation – If original packaging is not available, cover
the top opening of the cartridge with paper and store in a
dark cabinet.
Opening the cartridge package prior to use dramatically
shortens its useful shelf and operating life. Do not store on
the floor. If the toner cartridge is removed from the printer,
always store the cartridge:
• Inside the protective bag from the original package
• Correct side up in a horizontal position (not standing on
end)
• Do not store consumables in;
- Temperature greater than 40°C (104°F).
- Humidity range less than 20% and not greater than
80%.
- An environment with extreme changes in humidity or
temperature.
- Direct sunlight or room light.
- Dusty places.
- A car for a long period of time.
- An environment where corrosive gases are present.
• An environment with salty air.
Handling instructions
• Do not touch the surface of the photosensitive drum in
the cartridge.
• Do not expose the cartridge to unnecessary vibrations
or shock.
• Never manually rotate the drum, especially in the
reverse direction; this can cause internal damage and
toner spillage.
Use of non-Samsung and refilled toner
cartridge
Samsung Electronics does not recommend or approve the
use of non-Samsung brand toner cartridges in your printer
including generic, store brand, refilled, or remanufactured
toner cartridges.
CAUTION: Samsung’s printer warranty does not cover damage to
the machine caused by the use of a refilled, remanufactured, or
non-Samsung brand toner cartridge.
Estimated cartridge life
Estimated cartridge life (the life of the toner cartridge yield)
depends on the amount of toner that print jobs require. The
actual print-out number may vary depending on the print
density of the pages you print on, operating environment,
printing interval, media type, and/or media size. For
example, if you print a lot of graphics, the consumption of
the toner is high and you may need to change the cartridge
more often.
Redistributing the toner cartridge
When the toner cartridge is near the end of its life:
• White streaks or light printing occurs.
• The warning message, Toner Low displays on the control
panel.
• The Smart Panel program window appears on the computer
telling you that the toner cartridge is low on toner.
• The Status LED blinks red.
If this happens, you can temporarily reestablish print quality by
redistributing the remaining toner in the toner cartridge. In
some cases, white streaks or light printing will still occur even
after you have redistributed the toner.
1 Open the front cover.
2 Pull the toner cartridge out.
3 Thoroughly roll the toner cartridge 5 or 6 times to
distribute the toner evenly inside the toner cartridge.
NOTE: If toner gets on your clothing, wipe it off with a dry
cloth and wash clothing in cold water. Hot water sets toner into
fabric
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Changing cartridge:
_______________________________________________________

CAUTION: Do not touch the green underside of the toner
cartridge. Use the handle on the toner cartridge to avoid
touching this area.

4 Hold the toner cartridge by the handle and slowly insert
the toner cartridge into the opening in the machine.

5 Tabs on the sides of the toner cartridge and corresponding
grooves within the machine will guide the toner cartridge
into the correct position until it locks into place completely.

6 Close the front cover. Make sure that the cover is securely
closed.

Replacing the toner cartridge
When the toner cartridge is completely empty:

• The printer stops printing.

• The Smart Panel program window appears on the computer
telling you that the toner cartridge is empty.

• The Status LED lights red.

At this stage, the toner cartridge needs to be replaced. For
order information for toner cartridges, see page 7.1.

1 Pull the toner cartridge out.

2 Remove the new toner cartridge from its bag.

3 Roll the toner cartridge 5 or 6 items to distribute the toner
evenly inside the toner cartridge.

Thoroughly rolling the toner cartridge will assure
maximum copies per toner cartridge.

4 Remove the paper protecting the toner cartridge.

NOTE: If toner gets on your clothing, wipe it off with a dry
cloth and wash clothing in cold water. Hot water sets toner into
fabric.

CAUTION: Do not touch the green underside of the toner
cartridge. Use the handle on the toner cartridge to avoid
touching this area.

5 Hold the toner cartridge by the handle and slowly insert
the toner cartridge into the opening in the machine.

6 Tabs on the sides of the toner cartridge and corresponding
grooves within the machine will guide the toner cartridge
into the correct position until it locks into place completely.

7 Close the front cover. Make sure that the cover is securely
closed.
_______________________________________________

Good Luck!

Because I was getting gray shading on my pages and data was still being printing, I decided to change the toner cartridge. Now the pages are clean and white and all the lights function properly. Most cartridges that are running on empty don't print any data at all or at least print the data at the top of the page and gradually gets fainter sp? on the page. Who would have thought just by changing the cartridge would solve the problem? So glad that's all it was........wasn't excited about having to buy a new printer.

change your yellow toner insert new toner cartridge then solve your problem

unplug the printer for about 5 minutes thne remove the cartridges then after five minutes put the cartriodges back ion and power on the printer and after that check if you still have the toner light on if not try to print ....

f the Drum LED is still lit after replacing the drum unit, the Drum counter may not be reset.
Reset the Drum counter as follows:

1. Open the front cover.
2. Locate the control panel button under the LED lights on the left side.
3. Press the control panel button until all lights are lit, then release it.
   The Drum counter is now reset.

I got exactly the same problem and the "reset" didn't do anything. I fixed it by putting a piece of duck tape on magic eye on the cartridge.
Fallow those step to do the same thing as me:

1. Open the front panel.
   
2. Remove the toner and the drum
   
3. Remove the toner FROM the drum
   
4. On each side of the toner, there should be a little glass. Put the piece of duck tape on one of them. I put mine on the right side.
   
5. Put everything back in.
   
6. Turn on your printer if it's not already.
7. Now, the low toner light should be gone and the green light should be on.
   

Now, you can really empty your cartridge.