Lost wireless connection to HP Printer

I've suddenly lost my wireless connection, (which had been working fine for months), to my HP Laserjet 100 color MFP M175 color printer.
My wireless router is working fine, with no broadband connection problems. I've followed the (rather complicated) HP 'Help' pages, which basically suggest I hold down the blue 'wireless button' on the printer panel for 2 secs until it flashes and counts down from 2 mins. This is supposed to reconnect the wireless network, but I just get an error message 'Connection failed'.
I'm not an IT expert, and need someone to talk me through fixing this.

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Sorry but I can't talk you through it.

But I will try a few common issues. Can you share what CHANNEL the Router has the WiFi on?

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Wifi printer

What OS are you using? Does the printer show up in the system (control panel)? A bit more information might help but it sounds as if the wireless driver has dropped out for some reason. Typically uninstall/reinstall would be the thing to do. But again, a bit more info might help.

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Lost wireless connection to HP Printer

Not sure if this is what you mean, but my wireless router is Netgear brand, and my OS is windows 7.
The printer does show up under 'Devices' on my laptop.
When I first saw it was not printing, the Blue 'Wireless' light on the HP was on, but despite several attempts, (see original message), ithe printer won't reconnect wirelessley.

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