Found solution on another site - it was for error 5200 but it worked for this as well,
Start with printer powered off
1. Open cover of printer and verify that the ink cartridge carriage is not in the center of the printer. Leave cover open.
2. Unplug the electrical cord from the printer and wait 30 seconds.
3. Plug electrical cord back in, when ink cartride carriage moves to the center of the printer quickly unplug the electrical cord again. This should leave the ink cartridge carriage in the center of the printer so you can get to it.
4. Lift up the gray arm that surrounds the ink cartridges.
5. Remove the entire ink cartridge holder (not just the ink cartridges). It will lift out easily as a unit. Lower the gray arm that you lifted to remove the cartridge holder.
6. Close printer cover. Plug electricity back in.
7. There should be a message about checking the ink cartridge on the display (I can't remember exactly what it said but it was something like that).
8. Open printer, lift the gray arm that surrounds the ink cartridge area and reinsert the ink cartridge holder (with the ink cartridges in it). Lower the gray arm.
9. Close printer cover.
10. The display should appear normal now, and you should be able to print again.
Doug, May 2009