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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.

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2  
What happens if you try to preview the screensaver and don't move the mouse? – Ramhound Aug 22 '12 at 14:52
    
It works, the screensaver appears correctly with the preview button. It just doesn't start by itself without the preview button. – EtienneT Aug 22 '12 at 17:06

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?

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This may be because Windows is set up to sleep (or suspend) after a given amount of time. In this mode, the computer is kept in a "standby" state, not processing information or, in this case, rendering the screensaver.

As such, I recommend you to either disable or lengthen this time, by doing the following:

Control Panel > Hardware and Sound > Power Options - Change when computer sleeps

Adjust to at least 30 minutes or never. This should allow the screensaver to show.

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