I have checked with Variable Set Integer %N1% from Screen Width and Variable Set Integer %N2% from Screen Height
And fould out that
when the pc boot up without connecting the monitor, my pc has been entering the very low resolution mode such as 480x320(small playground).
so I need to look for the way I change the mode into which the pc enter without connecting monitor?
ps)
After the boot without connecting monitor, I tried to change the mode with "default display size" macro,
but got the error, which might measn, "default display size" macro don;t seem to change the display mode without monitor..