No alerts received on my Sony Xperia z2

[Ewen]

I have an Xperia Z2 tablet  and at one time I received an alert for emails and a blinking light in the upper right hand corner.  My wife has a Samsung Tab A and she gets an alert for whatsapp and Instagram... I dont!

I took my tablet into the local Telstra shop (I bought it there) and an assistant mucked aroung in the "Options" and now I have no alerts or lights at all.  How can I restore and set alerts again?

Any and all help will be appreciated.

[Ewen]

Thanks again, how do I get to safe mode?

[Uliwooly · Accepted solution]

@Ewen

This is how >>> safe mode

[Ewen]

Now that is really handy, thank you for that.  As an extention I was pageing through the Settings>Power Management and one of the settings indicated that enabling it would turn off notifications (can't remember which one at the moment) but I turned it off (disabled) and now I get the flashing light for emails only and also an audible alert.  So far nothing for anything else, but I'll let you know in due course.

Regards

[Uliwooly]

@Ewen

stamina mode