External display on late 2012 macmini does not go to sleep.

External display on late 2012 macmini does not go to sleep, instead the content freezes. After Pram reset it does go to sleep, till it undergoes next system sleep cycle (hibernatemode 25). I need to suspend it to disk because it is an offgrid setup and the power needs to be cut between Sessions. Display is connected to the hdmi port. Runing OS 10.8.4. Reinstalling did not help, neither. I have struggled with this for half a year now, it accured about 2 month after first use of the machine.
Thank you for possible help!

Hey
Thank you for the quick anwswer!
I am aware of what you described, here is the preferece file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
          <key>Custom Profile</key>
          <dict>
                    <key>AC Power</key>
                    <dict>
                              <key>AutoPowerOff Delay</key>
                              <integer>14400</integer>
                              <key>AutoPowerOff Enabled</key>
                              <integer>1</integer>
                              <key>Automatic Restart On Power Loss</key>
                              <integer>0</integer>
                              <key>Disk Sleep Timer</key>
                              <integer>10</integer>
                              <key>Display Sleep Timer</key>
                              <integer>0</integer>
                              <key>Hibernate File</key>
                              <string>/var/vm/sleepimage</string>
                              <key>Hibernate Mode</key>
                              <integer>25</integer>
                              <key>PrioritizeNetworkReachabilityOverSleep</key>
                              <integer>0</integer>
                              <key>Sleep On Power Button</key>
                              <integer>1</integer>
                              <key>Standby Delay</key>
                              <integer>4200</integer>
                              <key>Standby Enabled</key>
                              <integer>0</integer>
                              <key>System Sleep Timer</key>
                              <integer>0</integer>
                              <key>TTYSPreventSleep</key>
                              <integer>1</integer>
                              <key>Wake On LAN</key>
                              <integer>0</integer>
                    </dict>
          </dict>
          <key>LastSleepUUID</key>
          <dict>
                    <key>Date</key>
                    <date>2013-07-20T21:41:21Z</date>
                    <key>UUID</key>
                    <string>53DDFFCE-AFA3-402F-B35E-8CBED6E293DF</string>
          </dict>
</dict>
</plist>
Next on my list would be an installation from scracht - wich i would obviously love to avoid
The bewildering thing is that through a pram reset i can get the display to sleep once again...
Maybe a hardware prob?
Might want to check using the thunderbolt port instead, as soon as i can afford the adaptor.
Anyway i will go to offline world for some time now, on a crazy bicycle tour trough remote eastern europe.
I would love to hear from you on an occasion of a peek to cyberworld during my trip!
So long
Senior KLikklac

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