![](/images/backgrounds/286959/hp-deskjet-640c-users-manual-54879445x1.png)
4Getting Help When Things Go Wrong
![](/images/backgrounds/286959/hp-deskjet-640c-users-manual-54879445xi2.png)
What is the problem? | Possible cause | To solve the problem… | ||||||||
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Both lights are flashing. | The printer may need to | 1 | Press the Power |
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| button to turn the | ||||
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| be reset. |
| printer off. Then press the Power | |||||||
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| button again to turn the printer back | |||||
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| on. |
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| 2 | If that doesn’t solve the problem, press | |||||||
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| the Power |
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| off. |
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| 3 | Unplug the printer. |
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| 4 | Plug the printer back in. | |||||||
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| 5 | Press the Power |
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| button to turn the | ||||
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| printer on. |
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