Why won't my printer reconnect to Wi-Fi after setup?
Swipe down on the printer control panel to open the Dashboard, then go to Settings > Network Setup > Restore Network Settings and tap Yes — the Wi-Fi light will blink blue. Next, close and reopen HP Smart, then remove the printer from the Home screen and add it again following the on-screen prompts. (Page 4)
From the official HP Envy Inspire 7900e manual, page 4
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