Many thanks Mark, that fixed it.

Ed
> On 10 May 2015, at 07:00, M. Taylor <mk...@ucla.edu> wrote:
> 
> Hello Ed,
> 
> I suggest that you reset the system PRAM.  
> 
> To reset the PRAM, power on the Mac while pressing Option+Command+R+P until 
> the startup chime is heard, twice.  
> 
> It may be necessary to perform this several times until you are successful.  
> It can be tricky.  
> 
> Good luck,
> 
> Mark
> 
> -----Original Message-----
> From: macvisionaries@googlegroups.com 
> [mailto:macvisionaries@googlegroups.com] On Behalf Of Edward Green
> Sent: Saturday, May 09, 2015 10:23 AM
> To: macvisionaries@googlegroups.com
> Subject: Macbook Air suddenly slow to boot up
> 
> Hi,
> 
> My 2012 Macbook Air has suddenly become slow to boot up.
> 
> I am running Yosemite and have the hard drive encrypted.  I used to be able 
> to enter the password a couple of seconds after the startup sound, but since 
> last week, I have had to wait around half a minute before the password box 
> appears.
> 
> I’m not aware of having installed anything in particular over the past seven 
> days.  Does anyone have any ideas about why the machine may have suddenly 
> become slow to boot and what I might try? The machine does not seem to be any 
> slower during actual operation.
> 
> Cheers,
> 
> Ed
> 
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