Error 1203 What do I do?

There are 3 step to repair lexmark 1203 error

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ERROR 1203 LEXMARK ERROR 1200 Error 1203 is an issue that occurs either when a cartridge is bad or the printer cartridge Slot is bad...

1 - try cleaning the copper contacts of the both carts and cart slot in the printer and try again..
or
2 - when error shows up, shut the printers power off; wait one minute and turn it back on press copy.
Or try

Reset Factory Defaults on the Dellâ„¢ 964 or 966 Printer

To reset factory defaults on the printer, perform the following steps:

1. Press the down arrow button until Maintenance is highlighted and press the Select button.

2. Press the down arrow button until Reset Defaults is hightlighted and press the Select button.

3. The printer displays a confirmation message. Highlight Yes and press the Select button

Note:
Some settings such as phone lists, time, date, and country are not changed.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.

All The Best: Pineworks

1. Press Power to turn your All-In-One off.
2. Unplug your All-In-One from the wall outlet.
3. Plug in your All-In-One.
4. Reinstall the cartridges.

If this does not resolve the problem, replace your cartridges to fix the problem.

I have an error reading 1203 that won't let me print. Message consult users guide.

Have you recently refilled or replaced any of the cartridges. 1203 is usually one of two things.

1. An overfilled cartridge (fixed by wrapping in damp paper towel for a bit until excess ink wicks out)
2. Ink smeared on contacts (fixed by cleaning contacts on cartridge and on printer's cartridge housing)

Seen this lots with dell printers.
Error 1203 is an issue that occurs either when a cartridge is bad or the printer cartridge Slot is bad...

1 - try cleaning the copper contacts of the both carts and cart slot in the printer and try again..
or
2 - when error shows up, shut the printers power off; wait one minute and turn it back on press copy.
Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

1203 Printhead

short-circuit in
printhead.

Replace print
cartridge(s).

error # 1203 how do fix it

This link should have the answer for you.
http://www.dellcommunity.com/supportforums/board/message?board.id=A940&message.id=13761

I kept pressing menu, since it would not bring it up turned it off and on, it fixed itself, now it is printing.