I just swapped my old drives, etc. into a new Antec Sonata case with a
SOYO K7VMP mobo and when I press the main power button "ON", the power
supply turns on and the case LED lights up, but the system does NOT
boot.
If I press the RESET button, then the system will boot up normally.

Any ideas on what I do to fix this so the "power on" button functions
the way it should?

Thanks in advance!