During a storm the lights went out and my HP printer would not turn back on.

[Herringclan3]

During a storm the lights went out and my HP Officejet Pro 7740 Wide format all-in one printer would not turn back on.

The printer's home, back and Wi-Fi is lit up but the power button is not, and the printer will not start up.

 

[NonSequitur777]

@Herringclan3,

Welcome to our HP Community forum!

Sorry to hear about your HP OfficeJet Pro 7740 acting up after the power outage -storms can be brutal on electronics, especially when surge protection isn't in place.

From your description -the home, back, and Wi-Fi buttons are lit but the power button isn’t, and the printer won't fully power on, it sounds like the printer's logic board or power supply may have suffered a surge-related failure. This is unfortunately all too common when devices are directly plugged into the wall during electrical storms.

Here are a few things you could try before considering hardware replacement:

1. Basic reset:

   • Unplug the printer completely (including the power cord from the back of the printer and the wall).

   • Wait a full 60 seconds.

   • Press and hold the power button for 15 seconds (to discharge any residual power).

   • Plug the power cord back in directly into a wall outlet (bypass power strips or surge protectors temporarily to rule out any faulty intermediaries).

   • Try powering on again.

2. Different outlet test:

   • Try plugging the printer into a different known-working outlet, preferably on a different circuit.

3. Inspect for burnt smell or visible damage:

   • If you notice any unusual odor or signs of burning near the power port or vent areas, that’s a pretty clear sign of internal damage.

If none of the above helps and the printer is out of warranty, you're probably looking at a failed power supply unit/module or system board, both of which can be difficult and costly to replace on a consumer-grade AIO printer like your 7740.

Going forward, I highly recommend using a UPS (uninterruptible power supply) or at minimum a surge protector rated for sensitive electronics. Many modern surge strips even include a “Protected” light -if that light is off, the strip isn’t doing its job anymore.

Let me know if any of those steps helped or if you'd like guidance on next steps or alternative printer options.

Kind Regards,

NonSequitur777