I've run across some PCS cards (is that the term?) that prevent a Mac from 
waking up. One was a SCSI card, the other was a Belkin USB or firewire card. 
Both required shutdown and restart if the computer went to sleepl 

On Feb 4, 2010, at 10:26 PM, Stan Halpin wrote:

> 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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