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First check you have installed the toner properly. Reinstalled the toner cartridge after making the cartridge clean.
If the the printer cannot recognize the toner It may happens. Check it properly.You may have to replace the cartridge.
If you are using refilled toner cartridges then your toner cartridge may be leaking or the waste toner tank on the toner cartridge may be leaking. The other cause and more likely is the drum cartridge is leaking toner. I would recommend removing both cartridges. Then hold each 1 at a time over several sheets of clean white paper. Tap on the cartridges and see if any toner falls out of them. These cartridges are normally sealed and should not leak much if any toner. If toner falls out of either cartridge you will need to replace that cartridge.
Good Luck and Thank You for using Fixya.
You should still be able to do a printer test page (press the arrow button).
Look at the printed page(s) for the Photoconductor AND the Toner.
They show as OK when new (or very low count), and 100% when fully used.
It IS ossible that the toner cartridge has a faulty (or if a remanufactured cartridge - un replaced) chip.
Some 'after market' chips are not compatible with E250, and it IS possible that your replacement cartridge is for an E350, or E450 (which have different chips, and some of the poorer remanufacturers , and some reselers that don't do these very often don't know).
It could even be a Dell 1720 chip on the cartridge.
I make around150 Dell 1720, 20 E450, 50 E350 cartridges a month and only around 5 E250s, so this gives you an idea of the relative numbers, in the market
The green flashing light lets you know that the machine is recieving data. This is completely normal, however, the red (Attention) light can mean several things. There can be a door open, missing toner cartridge, out of paper, or paper jam. In this cause it is probably the toner cartridge. Typically on these machines there is an Orange or Green tab on the side of the toner cartridge that needs to be pulled to fully engage the cartridge. You may want to make sure this has been pulled and the cartridge has been properly seated.
Hope this helps...let me know if you need any further assistance