I have an HP p2050dn networked printer.
When trying to print anything, say just a normal Windows Test Page, nothing will print.
I can see the item build in the spooler and then go to the machine. On the machine the "ready" light will blink, meaning it is processing a job. But it will do that for days.
If I then try and print a second document, again, anything....the first item will actually print.
Now the second item is 'trapped' in the printer, with the "ready" light blinking.
I've tried uninstalling the printer.
Changing print drivers
Unplugging the printer