Serial to USB connection- HP Laserjet 4MP not recognised

I am trying to connect an HP Laserjet 4MP to my Intel iMac running OSX 10.5.8. sure its old, but it is solid and reliable. Slow does not concern me.
The printer worked fine when last used. I have just purchased a serial to USB cable for the printer as the printer originally used AppleTalk.
System Profile recognises the cable. The cable chip is a Prolific 2303 which I am told is Mac compatible and that seems confirmed as System Profiler lists the USB-serial controller. So why can the OS not see the printer?
Check the HP printer drivers? Of course! So far I have downloaded and installed 2 sets of printer drivers. The first was a Laserjet and Edgline print-only.mpkg. labelled OSX. Probably too old. The second, PrinterDriverUpdate v1.1.1 (350MB) from the Apple Archive. The Archive listed the 4MP in its list of drivers contained in the package. Can’t get them to work!
I cannot get bonjour to see the HP printer! I read elsewhere that others are using the old HP 4MP on snow Leopard so Intel and system compatibility would not seem to be a problem.
I found the HP site murder to negotiate and finally downloaded from Apple and AppleUpdate. If you know the correct HP URL for Mac driver downloades that may help. So far I have run into so many dead ends on that site I could fill an A4 page with criticism.
Does anyone have suggestions which may help please?
Update. I checked the printer drivers via manual driver selection and found the HP 4 plus v2013.111 driver which worked in the past. So the driver is there, why does Bonjour not see it? I click on add printer and nothing new is found!

Helpful response as usual thank you BDAqua.
Network shows USB controller Not Connected. When I select and click window at left on USB controller (Which is red) the resulting dialogue box does not offer Apple talk. Just Modem,DNS, WINS, Proxies and PPP. Apple Talk is only offered for Ethernet or Airport.
Having had a nights sleep on this problem I conclude the serial port has died.
I think I shall return the serial cable and try connecting with a 36 pin Parallel port.
Thank you for the thought.

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