I had windows 7 on my computer for some times, I decided to install windows 8. Had no problem with windows 7 with the same hardware. But now the screensaver won't start. Even if I set it to start after 1 minute. I have a wireless mouse and a wired keyboard.
If I remember correctly, certain mouse/keyboard's will do this without the proper drivers installed. Does this still happen if you unplug your mouse/keyboard and let the computer go into the screensaver?