Message says printer is offline

SOURCE: Mechanism Error - Print Cradle won't move! - HP 5650

This "plastic strip" is called the "carriage encoder strip". This strip dictates the timing of the carriage assembly. If the end slots aren't broken, you can re-attach it. Otherwise, you'll need to replace it. They are about $10.

SOURCE: hp 2355 all in one error message

mine HP was acting the same way after a jam. I contacted hp and they told me it was a hardware issue and that I would need to purchase a new printer. I found a KB on thier site for this issue. It involved removing both ink carts and then reseting the printer with the ink carts out. it seemed to work.

SOURCE: Paper jam that isn't

You could try a partial reset of the printer
Unplug the power cord
Reconnect power cord
When lights are flashing, press & hold On/Resume and PaperSize buttons
When only the On/Resume light is flashing, release both buttons
When On/Resume light is steady, reset is completed

SOURCE: HP Officejet Pro L7780 constantly gives false"paper jam" error

Step 1:
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The rollers should be cleaned if the paper fails to feed smoothly into the unit. All document and media rollers should be cleaned using a lint-free cloth lightly moistened with water.

1. The unit must be powered down and the power cord unplugged before cleaning the rollers. This will allow the rollers to be turned by hand in most cases. The paper should also be removed before cleaning the rollers.
2. Remove the rear access door to access the rollers. Clean any dust and debris from the rollers.
3. Open the unit and check the four small metal paper rollers (not the rubber rollers) in the interior of the unit. They should be clean and move freely. If these are not bright and shinny or have buildup on them, they should be cleaned. Also clean any dust and debris off of the rubber rollers.
4. Close the unit and reattach the rear access door.
5. Plug the power cord back in and power the unit up. It should reinitialize for about 20 seconds.

6. Print another extended self-test page.

Step 2:
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==== Partial Reset ====
Press and hold # and 3 button on the unit while plugging in the power cord.
Note: For models that are not fax capable, press Plus (+) instead of #.

==== Semi Full Reset ====
Press and hold # and 6 button on the unit while plugging in the power cord.
NOTE: For models that are not fax capable, press plus (+) instead of #.

==== NVM RAM Reset ====
Press and hold OK and Cancel button while plugging in the power cord

SOURCE: message says paper jam- Printer shows E - will not

Hi

replace cartridges