my mac won't recognise my new hp usb

[Adrian471]

I bought an off the shelf hp Laserjet Pro M15w from a high street retailer for my MacBook Air and I'm getting a total BLANK trying to install it by USB?! 

Spectacular BLANK!

The HP Smart App can't even find the Printer by USB etc.

[asmita6658]

Hi @Adrian471

Welcome to the HP Support Community. I'd be happy to assist you with the printing issue. 

To better assist you - 

1.) Is there an antivirus software installed on your Mac? If yes, please try disabling it and check if it works.

2.) Are you using a USB hub?

While you respond to that, go to System Information to check the if the USB is detected or not -

a.) From the Apple menu, choose About This Mac.

b.) Click System Report.

c.) Under the Hardware heading on the left side of the System Information window, click USB. USB 3 devices appear under USB 3.0 Bus, and USB 2 devices appear under USB 2.0 Bus. The printer should be under the USB 2.0 Bus.

Use these tips and procedures to help troubleshoot and avoid USB connectivity issues.

• Restart the printer and the Mac: Restarting the Mac and the printer can clear possible error conditions.

• Reconnect the cable: Disconnect and reconnect the USB cable from the printer and the computer.

• Connect to a different USB port: Connect the cable to a different USB port on the computer.

• Disconnect from a USB hub or docking station: If you are using a USB hub or docking station, try connecting the cable directly to the computer.

• Try a different USB cable: Use a different USB cable. HP supports USB cables less than 3 m (9 ft 10 in) in length.

• Disconnect other USB devices: If you have several USB-connected devices, such as another printer, the computer might not have sufficient power supplied to the USB ports to detect all of them. Disconnect any other USB devices that are not in use.

Note - Be sure that the printer is connected to a 2.0 USB port in the computer.

Make sure to update Mac and printer's firmware -

To update Mac, try these steps - How to update the software on your Mac

To update the printer's firmware - HP Printers - Updating or Upgrading Printer Firmware

You may also try these steps - Fixing Poor Print Quality

Hope this helps! Keep me posted. 

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Have a great day!