Screen saver won't come up

First of all, ...how do I know if my mac is Intel or PPC?  I bought it 4 days ago from the apple store so whatever they're selling now a days is what I got.  27" brand new Imac straight out of the box.
  Ok, ..now,...since the day I got it, the screen saver wont come on.  The desktop goes to sleep but thats it.  I've played around with the settings several times in response to other discussions and posts but nothing seems to work.  When I "test" the screen saver it works fine, ...it's just that when my computer goes to sleep, ...thats it,....black screen.  I've seen several posts stating that this is a problem with certain versions and when certain updates go through it will be fixed....yada, yada, yada.  I'm no Mac-pro, I've only just recently switched from PC but this seems to be a rather frequent problem based on what i've seen posted.
  Any ideas ?   ...please be specific and keep it simple if possible.  Assume nothing other than I know how to launch system preferences and find destop and screen saver tab.
Adam

you need to check energy saver to set up the times for the screen saver to click on for both battery and AC power...
go to system preferences, energy saver, select either battery or power adapter, optimization would be set to custom, show details, then select what time you want your screen saver to turn on...
thats it
cheers

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