HP Deskjet 630c printing odd characters

Maybe every other printing job, the printer just shoots out blank pages with lines of odd characters.  I found the problem and an answer on the HP website, but, it is a pain to have to do the turn off printer or turn off computer every other job. It didn't used to happen so often. It makes no sense to change the CPU or cable since it prints just fine every other print job.  Should I buy a new printer?

Hi Jeff,
It appears to be printer related and not with the PC.  I found a document about replacing the cartridges that the printer needed to be in on.  You indicated that the power cord was disconnected when you replaced the cartridges.  See attached link to that document.
Remove and Install ink cartridges
That being said, I'd start with removing the ink cartridges while the power is on.  Close the cover and I'd unplug the power cord and wait 60 seconds and then plug it back in again.  Wait until all of the printer activity stops, you should have lights blinking for you to put the cartridges in.  With the power turned on... Install the ink cartridges per the attached document.
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