Hi,
Try the following:
1. Turn off the printer .
2. Press the Stop button for 2 second and hold it.
3. Press the On button, hold it and release the Stop button.
4. Press Stop button 5 times then release together, with the On button.
5. LCD display will blank and now resetting.
6. Computer will detect new hardware just ignore it.
7. Turn off the printer then turn it On.
Remove the cartridges and clean the heads after powering it back on