Have you tried booting up holding 'alt' down or from a back up drive? there is 
also booting up in Target disc mode if you can connect two machines.
tom Samson
On 15/10/2011, at 8:20 AM, David Nicholas wrote:

> I need some help to get my machine working again.
> 
> I have a 27" iMac with Snow Leopard up to date.
> 
> This morning I had a screen problem after selecting an image from a  
> Facebook entry.  The cursor showed a hand and would move over the  
> screen but wouldn't select anything.  Eventually in desperation I  
> turned the machine off at the back.  After lunch I opened the box of  
> my new EyeTV Diversity.  Forgetting the machine was off I put the Eye  
> TV disk into the slot and then turned the iMac on.
> 
> When it starts to boot I get the Chime, the CD starts to whirr then it  
> gives up after about 20 seconds and I am left with a white screen.
> 
> The iMac is now dead and I can't eject the CD.
> 
> I tried booting with various keys held down like Option then the Shift  
> key.  The keyboard eject key had no effect.
> 
> I would like to get the CD out of course and then try booting again.
> 
> This message is coming from my wife's 24"iMac.
> 
> David Nicholas
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