Space bar on keyboard won't light monitor? Have you set mouse to 'allow this
device to bring computer out of standby'?
Control panel--- mouse---hardware---properties---power management.
Which power on button ---Monitor or CPU? If CPU power on button, you're
already in hibernate mode.
The settings I use are as follows:
Screensaver 10 minutes
Monitor off 5 minutes
Standby 10 minutes
Hibernate 1 hour.
As you can see, I don't have much use for screensaver.
If you are set up properly---when you click start --turn off
computer---standby changes to hibernate
when hitting the shift key. Hope this helps.