Display gibberish
Yesterday my display on my Prusa i3 MK3S shows random characters on about a .5 second cycle. Sometimes it goes to two rows of 20 little dark blocks on a backlit background. On rare occasions, it gives normal display only to go to the gibberish again. Octoprint works fine even with nonsense on the screen.
HELP! I can not change filament.
Check loose cables, contact support via chat
Could just be a loose cable. Look up the assembly manual online for how to check the cables (it's simple). Log on to the online store and contact support via chat. They're very good and should get you sorted out quickly.
Thanks for the suggestion
That is definitely possible. A few weeks ago i had to change the entire hotted including the thermistor and other cables. Things are so tight in there, perhaps i wiggled something I shouldn't have. Will open it up tomorrow. Will let you know. Thank you.
Factory reset
You could try a factory reset.
https://help.prusa3d.com/en/article/factory-reset_2216
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Chuck H
3D Printer Review Blog
It worked!
I just opened up the control box and did not remove anything, but rather pressed the ribbon cables to the display extra hard (and often) and it is working perfectly! Hope it lasts, but i am VERY hopeful. Thanks for the tip - I will remember to do that if it happens again.