All-In-One C4780 screen is stuck on a loop. How can I hard reset the printer?

I have a C4780 and am running Windows 7. I have had the printer for 2 years and never had a problem until recently. I have been unable to print for months because the touch screen on the printer is stuck in a loop. I first noticed the problem because I could hear random beeping and printer movement from the other room. It was doing it all on it's own. There were no changes to the computers, wireless or anything. I had just used it 2 weeks prior to print a passport photo and it worked fine.
It thinks I am trying to print from a memory card and asks me to insert the card. Then it thinks I am trying to print a passport photo. Then it thinks I am scanning and asks me to place the photo face down. (etc, etc) If I try to hit cancel on any of the screens, it moves on to a different task it thinks I want done. If I try to follow through with the task it wants to do, it cancels it on it's own and moves on to another task. It will also move through the screens and tasks without me around. It moves so quickly through the screens that when I do try to get to a certain screen, I sometimes can't, because the printer has taken off in a different direction of screens all on its own.
All software is up to date.
I have tried turning it off, unplugging it, waiting, plugging it back in, turning it on.
I have tried unplugging it while it is on, waiting, plugging it in and turning it on.
I tried a semi-full reset by pressing bottom left 4 times. It was actually really difficult because the printer kept changing screens randomly while I was doing it. I finally got it to do the reset. It got to the "now printing alignment page..." screen and then just moved on to the main screen. Never printed the page. Shortly after that it started doing the screen loop with wireless settings. And now it is back to doing a loop through all the screens again.
It seems to be pushing buttons on its own.
Does anyone have any idea of how I can fix this? Is there a way to do a hard-reset on this printer? Restore it to factory settings? Or doing you think there is something physically wrong with the touch screen where it is actually pressing buttons on it's own?

I'm having the same problem, including paper running through the printer randomly. I believe I completed a semi-full reset that (so far) has stopped the paper going through the printer. And, the random changes on the touch screen seem to have stopped too. But, the touch screen still lights up and goes dark randomly, whcih leads me to believe that all is still not well.
I too would like to try and hard reset if one is possible on this machine.

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