HP printers not printing

We have several HP4250n printers on our network, they are setup as IP printers, network is all cisco.
Very recently they have randomly stopped printing and will only work if the power is cycled, there are no errors on the printer when this happens.

Any ideas where to start looking?
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Two things that may help:

1. On the PC or server, change the Standard TCP/IP port setting from "Raw" to "LPR". When you do, also change the Queue name to "raw". To do this, click on the Ports tab in printer Properties, then on the Configure Port button.

2. Do a cold reset on the JetDirect card of the affected printers, as follows:

Turn the printer power off.

Power on the printer and watch for the memory count to begin.

Hold down the SELECT (Checkmark) button, when you see the memory count begin. Continue holding down the SELECT (Checkmark) button until all three printer control-panel lights flash once and then remain on. This might take up to 10 seconds.
After the message SELECT LANGUAGE appears on the display, press the UP ARROW button or the DOWN ARROW button until COLD RESET appears on the display

Press the SELECT (Checkmark) button. The printer performs a cold reset and then continues its power-on sequence.

You will need to re-enter the IP address details after the cold reset.

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If you have done all that hdhondt states and the issue is still occuring then you need to have a look at upgrading the firmware on these printers, open the ews of the printer in a web browser. put it's ip address in and go to the networking section, there is an option for upgrading the firmware, you can also download hp's download manager and firmware bundle and upgrade the lot of them in one go... but make sure you do this when noone is likely to be printing.
When the printers stop printing, take a test page from the menu.
Can you see ip-address on the IO page?

Try booting the server also (if not allready tested).
It may be a service on the server that is jammed...

Some PDF files may also jam the printing with no error message.
So like said, firmware update might help.
SCCHISAuthor Commented:
Everything seems fine after powering down and bringing them back up, if/when it happens again I will try each of your solutions as necessary and will split up the points.

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