Why is my system doing this? See details.

OK it’s most likely hibernation check your settings

That seems like normal sleep (or standby or S3) behavior to me, especially if the power button light is pulsing.

Could also be hibernation (or S4) if the power light is off and the computer goes through the usual boot up routine until it gets to Vista.

@mrentropy if it was standby it would have turned on if he pressed his keys

@MrGeneVan Not necessarily; it depends on how the computer is set up. None of my computers (home or work) are set to wake up on a key press. Some can be set to wake up on mouse movement, but I don’t use that, either.

Did you install some related software when you installed the UPS?

@jeffpetersen, yes.

And may I add, that I don’t have to press the tower’s power button all the way down to wake things.

Now, this may be relevant: When another user is using their account on the computer, when I go back to MY account, there’s a message about the USB cab’e to the battery is not plugged in (but it IS). A few seconds later, it goes away and the software shows that it’a recognizing the battery.