Volume control works but display has disappeared

[woolyback]

I went to alter the volume on my MacBook earlier and noticed that the volume control still works and makes a noise as it goes up and down, the icon alters on the menu bar, but I no longer see the visual blocks that appeared previously...

I found the following screenshot when searching for this to illustrate what is now missing. I guess it's a minor thing, but I would like it back and can't see anything under preferences that would do it.

Any ideas ?

 

[alphaod]

Is there a light coming out of your headphone jack?

 

[woolyback]

No.

I assume there shouldn't be ?



I never use it with headphones (or haven't for about 3 months)

 

[woolyback]

Also, I may be imagining this, but don't you also get a similar display for the brightness ?

As I don't now...