Screen shots off every few minutes after upgrade to 10.6.3

After upgrading to 10.6.3 my screen shots off every few (ca. 5) minutes when I hit either the mouse button or any key. The screen comes back by itself after about 2 minutes, the rest of the iMac continues to work (print jobs finalize, keybaord entries are recognized etc.).
Is this a known problem of 10.6.3 or is it just coincidence and simple a HW problem?

Try giving more details...was it any specific key; did you click the mouse in any place in particular? Was the mouse cursor in a corner of the screen (Hot Corners)?
You can try a Hardware Test to see if it actually is hardware-related. But if you've not seen it before, that's unlikely.
If you can't fix it, you can try to re-install 10.6.3 from the Combo update.

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