Imac not responding after mavericks upgrade- black screen

Ever since I upgraded to Mavericks 2-3 weeks ago ....if I leave my mac for a while and then try to wake it up with a touch of mouse or keyboard, the screen remains black. The mac is still on as its warm .The only way to recover this is to :
1. Pull out the plug - gives fresh reboot
2. Keep the start button pressed for approx 5-10 secs, then press it again and the mac powers up...to the state it was when left ie not a fresh reboot.
This is very annoying , has my wife yelling at me and no longer gives us the instant access from sleep we used to have ...
Any help appreciated !
Thanks Jon.
I have a 27" iMac from August 2010 (ie v soon after CPU upgrade) , core i3 processor

OK I appear to have fixed this ...after the Mavericks upgrade the screensaver was reset to loading photo's from "national geographic" which it did after a few mins...i have changed this to another option photo's of earch/space etc..now i can wake the imac from sleep immediately as before ....so now fixed !
Jon

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              1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
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              HP IO - Path: /Library/StartupItems/HP IO
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    Disk Information:
              WDC WD2500AAJS-40VWA1 disk0 : (250.06 GB)
                        EFI (disk0s1) <not mounted>: 209.7 MB
                        My iMac (disk0s2) /: 249.2 GB (22.18 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
    USB Information:
              Apple, Inc. Keyboard Hub
                        Apple, Inc Apple Keyboard
              Western Digital My Book 1110 999.5 GB
                        WORK (disk1s1) /Volumes/WORK: 375.81 GB (95.66 GB free)
                        PLEASURE (disk1s2) /Volumes/PLEASURE: 623.69 GB (35.57 GB free)
              Apple Inc. Built-in iSight
              Apple Inc. BRCM2046 Hub
                        Apple Inc. Bluetooth USB Host Controller
              Apple Computer, Inc. IR Receiver
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    Thunderbolt Information:
    Kernel Extensions:
              com.logmein.driver.LogMeInSoundDriver          (1.0.0)
    Problem System Launch Daemons:
    Problem System Launch Agents:
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              [loaded] com.adobe.fpsaud.plist
              [loaded] com.adobe.SwitchBoard.plist
              [failed] com.google.GoogleML.plist
              [loaded] com.google.keystone.daemon.plist
              [not loaded] com.logmein.logmeinserver.plist
              [loaded] com.microsoft.office.licensing.helper.plist
              [loaded] com.wdc.WDDMservice.plist
              [loaded] com.wdc.WDSmartWareServer.plist
              [loaded] rapiback.plist
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              [not loaded] com.adobe.AAM.Updater-1.0.plist
              [loaded] com.google.keystone.agent.plist
              [loaded] com.logmein.logmeingui.plist
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              [not loaded] com.logmein.logmeinguiagentatlogin.plist
              [loaded] syncmateStarter.plist
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              [loaded] com.adobe.AAM.Updater-1.0.plist
              [loaded] com.adobe.ARM.[...].plist
              [loaded] com.facebook.videochat.[redacted].plist
              [loaded] com.macpaw.CleanMyMac.helperTool.plist
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              AirPort Base Station Agent
              EarthDesk Engine
              LMILaunchAgentFixer
              AdobeResourceSynchronizer
              RealPlayer Downloader Agent
              Windows Phone 7 Connector Agent
              iAntiVirus
              TextEdit
              StatusMenu
              HP Scheduler
              WDQuickView
    3rd Party Preference Panes:
              Application Enhancer
              DivX
              EarthDesk
              Fan Control
              Flash Player
              Flip4Mac WMV
              Growl
              MacFUSE
              WDQuickView
    Internet Plug-ins:
              AdobeExManDetect.plugin
              AdobePDFViewer.plugin
              AdobePDFViewerNPAPI.plugin
              Default Browser.plugin
              DirectorShockwave.plugin
              DivXBrowserPlugin.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
              Flip4Mac WMV Plugin.plugin
              iPhotoPhotocast.plugin
              JavaAppletPlugin.plugin
              QuickTime Plugin.plugin
              RealPlayer Plugin.plugin
              SharePointBrowserPlugin.plugin
              Silverlight.plugin
    User Internet Plug-ins:
              Picasa.plugin
              Unity Web Player.plugin
              WebEx.plugin
              WebEx64.plugin
    Bad Fonts:
              None
    Time Machine:
              Time Machine not configured!
    Top Processes by CPU:
                  29%          mds
                   2%          WindowServer
                   1%          mds_stores
                   1%          LogMeInGUI
                   1%          RealPlayer Downloader Agent
                   1%          EtreCheck
                   1%          FanControlDaemon
                   0%          uTorrent
                   0%          notifyd
                   0%          networkd
    Top Processes by Memory:
              1.00 GB            mds
              106 MB             mds_stores
              78 MB              Google Chrome
              49 MB              Finder
              45 MB              WindowServer
              40 MB              Google Chrome Helper
              37 MB              VLC
              29 MB              uTorrent
              20 MB              EtreCheck
              16 MB              DashboardClient
    Virtual Memory Statistics:
              43 MB              Free RAM
              989 MB             Active RAM
              934 MB             Inactive RAM
              447 MB             Wired RAM
              4.25 GB            Page-ins
              454 MB             Page-outs

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