I have a VIA EPIA 800 with Windows XP Pro, if I use the start button for hibernate the pc i don't have problems, but I use the power button, the system stop 1 second and continue play the mp3,avi or any thing but don't hibernate.
I have already configured in the energy propertys the option for when i push the power button my pc start the hibernation state.
Using the hibernate option in the MediaCar it does not work either, does the same.

(sorry for my inglish)