Good morning.
Looking at that photo, I immediately notice that you don't have a cutting strip.
That tape I see is torn and could be the cause of the blade getting caught.
Next, there is a red button on the right end of the machine which limits the carriage movement ("home position") -- sometimes this gets stuck or fails.
Then, I would look at the ribbon cable that sits above the blade carriage and verify that it's intact. While you're doing that, (and since you already have the right-hand side cover off) make sure all the connections are OK -- plug and unplug them.
Let us know what you discover.