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Reset the product by following steps:

* Turn on printer , disconnect the power cord from the rear of the product.
* Unplug the power cord from the wall outlet.
* Wait at least 15 seconds.
* Plug the power cord back into the wall outlet.
* Reconnect the power cord to the rear of the product.
* If the product does not turn on by itself, press the Power button
* try printing again
* if this doesn't work.....refer to [https://guideusermanual.com/product-name-photosmart-7520-e-all-in-one-printer-series-manual&po=243460&lang=English|Hp Photosmart 7520 Manual] to contact HP technical support.

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