Have you tried an SMC reset? Does the system boot normally while the screen 
remains dark? A good test is can you change the volume and hear the clicks as 
you change it?

Regards

Sam

                
MacAmbulance Ltd.
Providing Affordable Mac/PC Support and Web Development

Sam Mullen ACMT
+44 (0)7747778022
[email protected]
www.macambulance.co.uk
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On 17 May 2014, at 07:11, Ranulph Glanville <[email protected]> wrote:

> My AirBook sometimes doesn't; turn on again on restart. The screen remains 
> dark. Sometimes waiting helps, Sometimes closing the lid and reopening works. 
> Mostly, however, I have to restart.
> 
> Any advice?
> 
> Ranulph
> 
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