It just doesn't. All new displays (displayport, DVI, HDMI) somehow are able to 
report their supported resolutions to the computer, even when they don't have 
mains power. Don't know how it works electronically, but it does.

Bryan 

-----Original Message-----
From: macvisionaries@googlegroups.com [mailto:macvisionar...@googlegroups.com] 
On Behalf Of Dan Roy
Sent: Sunday, July 11, 2010 2:53 AM
To: macvisionaries@googlegroups.com
Subject: Re: Using a Mac Mini without a monitor

This is a great explanation, but, how come it works even if the monitor is 
turned off.  Since there's no signal, I am not sure why it still thinks there 
is!!


On Jun 28, 2010, at 8:44 AM, Frank Carmickle wrote:

> Hello Bryan
> 
> On Jun 28, 2010, at 5:45 AM, Bryan Smart wrote:
> 
>> Because apps like Safari decide how much information that they can show at 
>> once based on the current display resolution. The Mac determines the 
>> available screen resolutions by determining the type of monitor that is 
>> connected. When no monitor is connected, no screen resolution is defined, 
>> and so any program that depends on screen resolution will go wacko, as it 
>> thinks you have a screen with size 0. Can't fit a lot of information on a 
>> screen with size 0. Most programmers never test for that situation, because 
>> they can't test without some sort of monitor connected. Apple could fix 
>> Safari, but that's just one program among many that will go bonkers with a 
>> size 0 screen.
>> 
> You are absolutely correct.  I thought that Apple could just implement a 
> dummy video driver that one could set their own parameters.  Do you see any 
> reason why this wouldn't work?
> 
> --FC
> 
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