Mac Mini does not detect DVI monitor on boot but does so on awake

Hi,
my Mac Mini fails to detect a monitor on the DVI port when it boots (monitor says no signal).
If I leave it a few minutes to boot, then put it to sleep and awake using the power button, then the display appears.
This problem does not occur with the DVI-to-VGA adapter, and I have tried with 2 separate DVI monitors (different brands) and cables (both monitors are fine with Windows PCs).
I have tried various resolutions and color depths, to no avail.
Any ideas about how to resolve this?

What brand and model of monitor do you have?

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Mac Mini does not detect DVI monitor on boot but does so on awake

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