I have the same problem on my Mac Mini 1.66GHz Intel Core Duo. I bought it in 2006 and until recently was using it with an AOC monitor using the VGA adapter and the monitor's VGA input. I recently switched to a DVI-D cable connected to the monitor's DVI input. When it boots up the screen is blank and the display says "no signal". Yes, the monitor has the DVI input selected.
I discovered that if I press the Mac's power button (putting it into sleep mode) and then press it again (waking it up), the desktop displays on the screen just fine.
If the Mac can recognize the display on wakeup why can't it do so on boot?
I discovered that if I press the Mac's power button (putting it into sleep mode) and then press it again (waking it up), the desktop displays on the screen just fine.
If the Mac can recognize the display on wakeup why can't it do so on boot?