I have a home network of 3 PCs using WinXPpro SP3, and connected to a
network printer (HP 2605 laser) via a router.

This has worked perfectly for years.

But suddenly one of the PCs will not print to the printer -- the jobs appear
in the PC's printer queue, but it says the printer is PAUSED. I have tried
all the obvious things (etg click Resume; rebooted PC, rebooted printer).

The other two PC's still print OK. This PC prints OK to a different
printer. Network file access still works OK. I do think any new software or
update has been installed recently.

Any suggestions please, as to why WinXP thinks this printer is paused??