Thank you Robin, Bob, Ronda, Bill for coming to my rescue.
Bob sorted me out last night by Command Option -
I have the white magic mouse and only clicked it perhaps twice when this 
occurred.

Thanks again, you are all worth your weight in gold !!

Cheers
Jewels

On 20/01/2013, at 6:56 AM, Ronda Brown wrote:

> Hi Jewels,
> 
> Are you using a Magic Mouse or a scroll wheel mouse?
> Have you inadvertently triggered Screen Zoom feature?
> 
> Open System Preferences > Mouse - is Screen Zooming turned ON?
> "Zoom using scroll wheel while holding" (if you have a Magic Mouse you won't 
> see this). 
> 
> Also in the Seeing view in the 'Universal Access' preference pane
> Click the 'Options' button, and if you're certain that you never want to use 
> screen zoom, uncheck the "Use scroll wheel with modifier keys to zoom" check 
> box.
> 
> Cheers,
> Ronni
> 
> Sent from Ronni's iPad4
> 
> On 20/01/2013, at 12:05 AM, Julie Bedford <jew...@iinet.net.au> wrote:
> 
>> Hi
>> 
>> Earlier this evening I tapped my mouse on my new Mac Pro (OS 10.7.5) which 
>> did something to my screen.  I can only see my top menu buttons and no dock, 
>> or if I fiddle with the curser, I can get
>> the dock visible but then the top menu disappears off the screen.  To the 
>> right and left, icons are disappearing off the screen.  
>> 
>> I am sure this is something which everyone knows about, but I cannot fix it. 
>>  I have tried changing the display to no avail.  Can anyone help me please ?
>> 
>> Cheers
>> Jewels
>> 
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