Only boots when monitor is attached!

Hi, everyone. . . 3 computers: Laptop, box A, and box B. I want to control box A and box B from my laptop via VNC. I have no keyboard or monitor plugged into box A or box B only power and ethernet. This works just fine on box B, but box A only boots if a monitor is attached to it.

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Hi, everyone...
 
3 computers: Laptop, "box A", and "box B".
 
I want to control "box A" and "box B" from my laptop via VNC. I have no keyboard or monitor plugged into box A or box B -- only power and ethernet.
 
This works just fine on box B, but box A only boots if a monitor is attached to it. I looked through the bios settings, and found nothing helpful. It is not a keyboard issue.
 
What happens with box A is that, when no monitor is attached, on power up it will spin the fans, and the hard drives will spin up, but there is no post (not even the initial beep). If a monitor is attached at that time (after having powered up), there is only a black screen.
 
If I power it up whith a monitor already attached, everything is just fine.
 
Box A:
Asus A7M266 mobo / Award Medallion BIOS v 6.0 / 1.33 GHz Athlon C / nVidia GeForce 2 in AGP slot.
 
Any ideas??
 
Thanks!

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