C310A WILL NOT FEED PAPER. PRINTER CLICKS. If IT PUSH PAPER IN BY HAND, IT WILL PRINT, BUT NOT AUT

HP PHOTOSMART 310A printer will not feed paper.  It is about 6 months old, with minimal use at home.  It has always done a lot of clicking, but now when it would normally feed the paper, it clicks for several seconds, and the top piece of paper does not feed,  it then clicks again, like it is trying feed paper, then to back the paper out, and then stops.  The printer then posts a no paper in tray error.  When I reload it does the same thing again.   Does the printer not have a optical paper in tray sensor?  It should be able to see the paper is in the tray fairly easily, not sure why it uses the feed roller to sense paper?
It does not seem to work, regardless of the number of sheets used.  1, 10, 25, or mostly full of paper.  
The clicking sounds more like gears slipping, rather than the normal clicking it makes all the time.  (with about 30 or 40 clicks in a few seconds, all at a fairly regular rate.)
it only clicks after the little arm extends down and touches the top of the paper stack.  There is a metal arm, with two white wheels that is dropped from above the paper onto the tray, and it appears to be that arm that is clicking.  It looks like it is trying to push the first (top) sheet of paper into the printer.  The top sheet does not move.   If I push the paper, it will take the paper and run just fine for that one sheet.
I opened the back, and there is an area with a couple of larger wheels that look like they feed the paper up from the tray into the printer.  In that area there was a cardboard piece with CN503-00012 printed on the side.  It appeared to be loose in the cover, and not sure what that is for? if it should be there? or if it is related,  I removed the cardboard piece.  Not sure what to do with that.  I do not think it is nessisarily related, since if I can feed the paper by pushing it, it takes it and prints.
Help explain what is going on.
John

I do not recognize the cardboard peice you describe - I just opened up my c310a and did not see anything like this.  It may have been part of the packing material....
At any rate, I would suggest following the troubleshooting steps in this page.
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
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