Not sure of your question. When you say "won't boot" are you talking about a 
system that is turned off, and now you are turning it on? One that is asleep 
and you are waking it? One where one user is logged in, you are trying to 
switch to a different user? Or one that is running, and you chose File Menu 
Restart?

If it is the later, I can say that since at least system 10.4.2 or so through 
system 10.6.2, on a variety of laptops and desktops, I very seldom get a clean 
system restart via menu selection. If I load system upgrades/patches that 
require a restart, managed by the patch software, they likewise do not restart 
produce a restart. Blue screen with spinning wheel. Since that is the one and 
only issue I can remember having with Mac system software, I just use the power 
button to do a hard startup, mutter a bit, and forget it until next time.  I 
have never seen any indication that there is any hardware, software, or file 
corruption issues stemming from the use of the hard startup.

stan
 
On Feb 4, 2010, at 11:19 AM, Mark Roberts wrote:

> Here at the college we have both Mac and Windows systems. The Mac in my 
> office won't ever boot for me on the first try. It always locks up just 
> before the Dock should appear and has to be re-booted via the front panel 
> power switch. Second try always works. Any suggestions?
> 
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