My experience is different. My DSL router died in the night and I had to install the old one. I just changed the wireless settings on my C7280, and now all three connections work. If no wire (ethernet or USB) is connected, the wireless connection works. If the Ethernet cable is connected, it works via Ethernet, and if the USB cable is connected, it works via USB. It seems to default in that order.
I discussed this with an HP tech & worked on the solution myself to verify his answer &, of course, he was right!
Your printer will only recognize one connection: either wireless or hardwired but NOT both. That is why it keeps switching back to hardwired mode.
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run the wireless setup wizard on the printer from the front panel menus of the printer...this would assign an IP address to the printer from the router...then use the s/w cd that came along with the printer and get the drivers and s/w installed on your computer....if you want a wireless connection it would give you approprite options
you will have to uninstall the scanner drivers from the computer in the control panel>scanners..then uninstall the printer drivers from the printer in the control panel and then run the wireless setup wizard on the printer then try reinstalling the drivers and the s/w using the disc that came with the printer......see if works
I am not an expert, only a c7280 user. I use my printer wirelessly and was having problem scanning when using the controls directly on the printer (scan menu). By trial and error, I tried scanning by going to HP solution center on my computer and just followed the directions from the scan menu. That worked. If you can print wirelessly, you can scan wirelessly. I agree the HP support is a huge waste of time. I only get mad talking to them.
Download latest driver bundle (198mb) and the network reliabilty patch. Install the HP software choosing Connected via USB. Install the network reliability patch from the C7280 downloads page. Re-run the 198mb installer and choose Add a Device.
Create a new folder on your desktop and name it newhpdrivers(substitute your manufacturer in new name).Un-intall printer and printer software completely.Go to manufacturers website and navigate to their drivers/downloads or support menu.Select your model, choose the relevant software and download to the new folder you created on your desktop.Power down your computer.Reconnect the printer to the computer and turn printer on. Power on pc.Windows will detect new hardware and ask if you have the manufacturers install cd or a location to check for install files.Direct the wizard to your new software, follow the rest of the setup instructions and your done