Hi Peter, I did a quick google and found this question and answer which solved 
someone's problem. If your son has the original install disk he should boot up 
in from the install disk, by holding down "c" when starting up. He can then run 
disk utility on his hard drive to check for problems as a first step. Also, we 
need to know which operating system he is running.

  
http://www.mac-forums.com/forums/os-x-operating-system/271143-macbook-pro-wont-boot-up-no-recovery-disk.html
 Regards, Susan
Sent from my iPad

On 13/01/2013, at 12:59 PM, Peter Crisp <[email protected]> wrote:

> My 12 yo's MacBook has refused to boot up after shutting down in the normal 
> way a few nights ago.
> 
> I am remote so trying to resolve this remotely from him is a bit challenging. 
> 
> I did a quick google and it suggested to try boot up in Safe mode. 
> 
> He tried this but screen stays on the grey screen with a circle with a 
> diagonal slash through it the whole time. I left overnight thinking it might 
> be processing but to no avail.
> 
> Are there a series of steps to go through to maybe work this out?
> 
> We have full backup on Time Capsule to restore content if it turns ugly.
> 
> Any tips appreciated.
> 
> Regards
> 
> Pete
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