Display will not let CPU sleep

I have a custom built CPU with a NVIDIA Quadro FX 380 LP graphics card, and a Lenovo monitor #LI2321swA connected with a HDMI cable. I just recently hooked the two units together with the HDMI cable and now the monitor will NOT let the CPU go to sleep. The monitor keeps displaying the message "Power Save Mode" or some thing similiar. I can not figure out how to turn this feature off or how and what to set in control panel to change this. There was no instruction sheet, manual or CD with the new monitor, bummer.
kenz5103

After searching online I now see that there are lots of issues with Minis not waking from sleep. To clarify, my issue is not just when the machine has been asleep for a long time—the problem occurs just as frequently immediately after I put it to sleep. I have been keeping my Energy Saver settings for both computer and display at "Never," and just turn the display off manually when I know I'll not be using the computer for any period of time.

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Try a SMC reset:
http://support.apple.com/kb/ht3964
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Display will not let CPU sleep

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