Aporte original por: libunu ,
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.