What happens between the chime & the grey screen on boot?

Hi,
My Mac Pro has recently started taking up to 30secs to reach the grey screen when booting. The chime happens shortly after (re)starting, and then there's a significant pause, where nothing seems to happen (even the Apple Display stays in stand-by mode), before the HDD starts reading and the grey screen appears. I tried using Verbose mode, but the data it prints to screen doesn't start until after the long pause, so…
Anyone know what the Mac Pro could be doing? I've no other problems with the machine.
Thanks,
S.

Hi,
My issue has been solved, apparently by a combination of a PRAM reset and re-selecting the startup disk in System Preferences. My machine now moves from chime to Apple logo almost instantaneously
The AppleCare representative was thorough and walked me through various steps that narrowed down the issue, and his hesitant conclusion was that somehow, as hatter suggested, the Mac was taking its time to find the appropriate boot device - possibly as a result of a change I had made in my BootCamp partition (Windows 7) or as a result of a previous PRAM reset (as hatter suggested).
Case closed! Yay!
S.
EDIT: So, Japamac, it was presumably the "system selection" part of the post-Chime process that was causing the delay. Didn't see your post till I returned to respond with this post, but thanks for the effort anyway
Message was edited by: SiRGadaBout

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