[UniMacTech] Prompted for Startup Volume on boot?

[Nigel Kersten]

On Aug 19, 2008, at 6:02 PM, Mark Szota wrote:

> Hi folks
>
> Have noticed since around 10.5.3 on some of our Intel macs (Macbooks  
> and iMacs now running 10.5.4) that we are occasionally prompted to  
> pick the startup volume on boot. It doesn't always happen, just  
> occasionally. Have done the usual steps of repairing disk  
> permissions, wiping caches, reconfirming the startup volume and so  
> on but I just can't seem to nail the problem.
>
> I remember seeing a thread on the Apple forums about it but I can't  
> seem to find anymore. Is this a known bug or have I missed something  
> obvious?

Check that these Intel Macs are partitioned using GPT not APT.

Apple have shipped us a fair few Intel Macs that aren't GPT  
partitioned, and it produces this irregular symptom, and also results  
in things like Boot Camp not working.