Mathematica does not display/evaluate output?

Questions
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1

Dear all,
I recently re-installed Mathematica 10.3.1.0 on Mac OSx x86. If I type any command and press SHIFT+ENTER, no output is produced, please see the screenshot below. Do you know why this is happening?

Thank you!

ScreenShot2019-12-27at1.06.35AM.png
ScreenShot2019-12-27at1.06.35AM.png1610×1456 20 KB

2

Perhaps this is trivial, but I want to be sure: It is essential that your cursor be within the cell when you hit SHIFT+ENTER. In your screenshot, you have the line below the cell, and if you hit SHIFT+ENTER in this scenario, nothing will happen.

If you arrow key up into the cell, does SHIFT+ENTER still fail?

3

Cursor is inside the cell but still, it is not showing any output. The cursor is blinking horizontally on the line. I am using the web version. I have stable internet connection, everything is loading except this.

Screenshotfrom2023-02-2421-01-59.png
Screenshotfrom2023-02-2421-01-59.png908×429 13 KB

4

If the cursor is blinking horizontally it is not in the cell above. It is waiting for new input into the next cell. Click somewhere around 2+3 and hit SHIFT+ENTER

5

No, the cursor is horizontal after I have clicked Shift+Enter.

Before that, It was inside the cell above just next to 2+3

6

What happens with the menu command Evaluation > Evaluate Notebook? This should evaluate everything in the notebook file.

7

Try going to Evaluation → Default Kernel, and select Local.

I had this same problem and was able to correct it in this way.