# How to switch on error messages in mathematica 10?

I have mathematica 10 and 8 on different computers. Version 8 always shows me the error message about what goes wrong while I don't see any error message in version 10. I find it quite inconvenient as it take much time to figure out the problem. How to switch on error messages in version 10 ?

I remember that version 10 did show the warning messages, but somebody calculated something using my mathematica and all error messages were gone after that.

• Does executing On[] help? – Karsten 7. Mar 20 '15 at 7:36
• yes, it turns on some message if I know what kind of messages it is. Do I have to turn them on 1 by 1? – mastrok Mar 20 '15 at 8:23
• You can try going to the menu bar Edit ▶ Preferences... and click "Reset to Defaults" under the Messages tab. – Karsten 7. Mar 20 '15 at 9:03
• I solved it and thank you very much. – mastrok Mar 20 '15 at 9:11
• After your code add // Quiet. – David G. Stork Mar 20 '15 at 10:21