Stand By Mode turning back on

Whenever I try and put my computer on Stand By, it always reactivates itself within a couple seconds. I do have a laser mouse (Dynex), though I've made sure it wasn't moving while in standby. My computer is a HP Pavilion a1600e.

Is there any way I can set the reactivate controls to one button, like the space bar? So it would not come back on when there is mouse activity, only when I press a certain button.

Thanks!

 

if its a laptop, unplug the computer before putting it in standby, then plug it in after it is in standby. see if that will work. what operating system?
also go here --> http://forums.techguy.org/windows-nt-2000-xp/574498-windows-standby-mode-powering-back.html