windows 8.1 screen going black

I am running windows 8.1 and I've set my screen to not go to sleep until 3 hours, never go to sleep.  But after about 1 or 2 minutes, after stepping away from my PC, the screen goes black.  Why is that?  Where do I change that setting, as I couldn't find it anywhere???

Thanks...
DanNetwork EngineerAsked:
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McKnifeConnect With a Mentor Commented:
There are no other power settings, but I understand your point. Wasn't there a common win 8 problem with power management (also mentioned at ee)? Would have to google myself.
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McKnifeCommented:
Hi.

Many computer manufacturers pre-install their own power management software which overrides windows own settings. Are you able to find out what software that could be?
If not, please name the computer model.
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DanNetwork EngineerAuthor Commented:
I have a Dell desktop PC.  I was running windows 7 Pro, and it never did that with win 7, so I don't think it's the PC, but windows 8.1 setting somewhere.
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DanNetwork EngineerAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for afacts's comment #a39787437
Assisted answer: 500 points for McKnife's comment #a39787101

for the following reason:

Thanks for your input anyways!!!  I appreciate your willingness to assist!
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DanNetwork EngineerAuthor Commented:
Thanks for your willingness to help!!!
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