To set up your **HP ENVY Inspire 7900e series printer** via 123.hp.com, follow these steps:

1. **Unbox the Printer**
– Place the printer on a flat, stable surface near a power outlet.
– Remove all packaging materials including tape and cardboard from inside and outside the printer (print area, paper tray, cartridge access door).
– Close all doors and trays before powering on the printer[1].

2. **Power On and Connect**
– Connect the power cord and turn the printer on.
– Do *not* connect the USB cable yet, as the connection is established during software installation[1].

3. **Install Ink Cartridges and Load Paper**
– Open the cartridge access door and install the ink cartridges as prompted by the printer display.
– Load paper into the main tray and close it properly[1][2].

4. **Download HP Smart App or Printer Software**
– On your computer or mobile device, visit **123.hp.com/envy** or **123.hp.com**.
– Download and install the HP Smart app (available for Windows, macOS, iOS, and Android).
– Follow the prompts to connect your printer wirelessly or via USB[2][4][5].
– HP Smart helps you finish setup, including establishing network connection and printer preferences.

5. **Complete Setup via Software**
– Follow the on-screen instructions in the HP Smart app to complete setup, which might include printer registration, firmware updates, and print test pages.
– Once connected and setup is complete, you can use your printer with your device[3].

A helpful video on unboxing and setup is also available from HP Support on YouTube, detailing these steps visually[2].

**Important tips:**
– Always remove all packing materials inside the printer before powering on.
– Do not connect cables before software prompts to avoid connection issues.
– Use HP Smart for the easiest setup experience.

If you need direct setup guides or user manuals, HP’s official support site provides detailed instructions for the ENVY 7900e series[1][3].