I have a USB connection to my computer. Egistec Es603 Windows 10 Driver. Had the same issue of it not working. I do not know if this will solve the problem if it is another type of connection. When computer is off unplugged USB connector. Downloaded generic driver from HP 1320 product page on HP.com When installing there is the option to select 'USB' Completed installation. I plugged in USB connector.
Download HP LaserJet 1320n Printer Drivers for Windows 7, 8.1, 10, Just update HP LaserJet 1320n Printer drivers for your device now! Hp laserjet 1320 driver windows 10 free download - hp LaserJet 1320 PCL6, hp LaserJet 1320 PCL 6, hp LaserJet 1320 PS, and many more programs.
I believe it is safer to plug it in when computer is off, but I do not know if Windows will still detect the printer. Windows automatically detected my printer. Brother Mfc 490cw Driver Windows 10 more.