Why won't my Mac Pro go to sleep any more?

I upgraded to yosemite I a few days later I noticed that my mac pro (3.1 early 2008 dual 2.8 xeon processors, two sad's one hdd, 14GB memory) doesn't go to sleep any more. When I choose sleep from the Apple menu the displays go dark and it looks like it's sleeping, but the system is still humming along, as if a fan or an HDD is still spinning. I can shut it down just fine, but would really like just to have it go to sleep like it used to.
I also recently added a PCIe USB 3.0/eSATA card for external connections (From OWC, compatible with my system).
Any known issues that would cause this?

Hi ..
Open System Preferences > Energy Saver then click: Restore Defaults
Then select Sleep from the Apple  menu.
See if that makes a difference.
If not, reset the PRAM > OS X Yosemite: Reset your computer’s PRAM
BTW, if connected, external drives can prevent the Mac from going in to sleep mode.

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Mac Pro
Date introduced
Original Mac OS X included
(see Tips 1 and 3)
Later Mac OS X included
(see Tip 1)
Mac OS X Build(s)
(see Tip 2)
Mac Pro (Late 2013)
Dec 2013
10.9
13A4023
Mac Pro (Mid 2012)
Jun 2012
10.7.3
10.8, 10.8.3
11D2001, 12A269, 12D78
Mac Pro (Mid 2010)
Aug 2010
10.6.4
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10F2521, 10F2554, 11A511a, 11C74, 11D2001
Mac Pro with Mac OS X Server (Mid 2010)
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Mac Pro (Early 2009)
Mar 2009
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9G3553, 10A432
Mac Pro (Early 2008)
Jan 2008
10.5.1
10.5.2, 10.5.4
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Mac Pro
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Why won't my Mac Pro go to sleep any more?

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