Recently, I bought a original Intel 865gbf mobo, Processor P4 2.40A,
Kingston Memory 512MB, case delux m426n, power supply 550W, Windows XP
SP1.

The problem is that when I switch on the voltage regulator in order to
power up the system, it start immediately, without press the power on
button in the case.

Then I shutdown the system and I can start it normally. (¨Pressing the
power
on button).

The problem returns if I switch off the voltage regulator and switch on
it again.

I suspect that the problem could be in the power supply.

Can somebody orient to me?

Thanks from Colombia.