Computer shuts down and starts up by itself. I have 27" mid-2011 model. Has been like this for 2 years now. The hard drive and the mother board has been replaced already. No help, the problem still returns.

This morning it started again.
When I write the word "shut" to console it says:
kernel[0] Previous shutdown cause: 0
locationd[55] locationd was started after an unclean shutdown
kernel[0] Previous shutdown cause: -128
locationd[55] locationd was started after an unclean shutdown
locationd[54] locationd was started after an unclean shutdown
kernel[0] Previous shutdown cause: 3
Yosemite is installed. But the problem has happened with every operating systems.
Disk utility can't find any problems.
No usb or other devices are connected.
I deleted the file: com.apple.PowerManagement.plist (someone suggested that it may help)
I think it's not the matter of heat, because the problem occurs right away when starting my comp.
With a safe mode it sometimes stays up for hours. So could it be a problem with applications, rather than hardware?
Help is highly appreciated!
Thank you!

Thank you, I did ran etrecheck.
Here's the result.
Now my computer did shuts down even in safe mode, sometimes in seconds.
So I have to keep this short.
Hardware Information: ℹ️
    iMac (27-inch, Mid 2011)
    iMac - model: iMac12,2
    1 2.7 GHz Intel Core i5 CPU: 4-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 0/DIMM1
            Empty
        BANK 1/DIMM1
            Empty
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    AMD Radeon HD 6770M - VRAM: 512 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.1 (14B25) - Time since boot: 0:2:47
Disk Information: ℹ️
    ST2000DM001-1CH164 disk0 : (2 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 2.00 TB (1.68 TB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    OPTIARC DVD RW AD-5680H
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
    Apple Internal Memory Card Reader
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Library/Extensions
    [not loaded]    com.wacom.kext.ftdi (1 - SDK 10.9)
        /System/Library/Extensions
    [not loaded]    com.wacom.kext.wacomtablet (6.3.10 - SDK 10.9)
Problem System Launch Daemons: ℹ️
    [failed]    com.apple.systemstatsd.plist
    [failed]    com.apple.ucupdate.plist
    [failed]    com.apple.watchdogd.plist
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist
    [not loaded]    com.adobe.AdobeCreativeCloud.plist
    [not loaded]    com.wacom.wacomtablet.plist
Launch Daemons: ℹ️
    [not loaded]    com.adobe.adobeupdatedaemon.plist
    [not loaded]    com.adobe.fpsaud.plist
    [not loaded]    com.microsoft.office.licensing.helper.plist
User Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist
    [not loaded]    com.adobe.ARM.[...].plist
    [not loaded]    com.spotify.webhelper.plist
User Login Items: ℹ️
    iTunesHelper    Ohjelma (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Spotify    Ohjelma (/Applications/Spotify.app)
    SpyderUtility    Ohjelma (/Applications/Datacolor/Spyder4Pro/Support/SpyderUtility.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6
    Flash Player: Version: 16.0.0.305 - SDK 10.6
    Default Browser: Version: 600 - SDK 10.10
    SharePointBrowserPlugin: Version: 14.1.0
    Silverlight: Version: 5.1.30514.0 - SDK 10.6
    WacomTabletPlugin: Version: WacomTabletPlugin 2.1.0.6 - SDK 10.9
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    WacomTablet [Click for support]
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: NO - Auto backup turned off
    Volumes being backed up:
        Macintosh HD: Disk size: 2.00 TB Disk used: 316.51 GB
    Destinations:
        My Book [Local]
        Total size: 2.00 TB
        Total number of backups: 8
        Oldest backup: 2013-11-03 12:06:31 +0000
        Last backup: 2015-02-17 10:06:36 +0000
        Size of backup disk: Adequate
            Backup size 2.00 TB > (Disk used 316.51 GB X 3)
Top Processes by CPU: ℹ️
         2%    WindowServer
         0%    AppleSpell
         0%    ps
         0%    fontd
         0%    launchd
Top Processes by Memory: ℹ️
    94 MB    Finder
    86 MB    WindowServer
    73 MB    Spotlight
    69 MB    com.apple.internetaccounts
    64 MB    NotificationCenter
Virtual Memory Information: ℹ️
    589 MB    Free RAM
    1.91 GB    Active RAM
    1.34 GB    Inactive RAM
    451 MB    Wired RAM
    1.04 GB    Page-ins
    193 KB    Page-outs
Diagnostics Information: ℹ️
    Feb 27, 2015, 12:16:17 PM    /Library/Logs/DiagnosticReports/WacomTabletDriver_2015-02-27-121617_[redacted]. crash
    Feb 27, 2015, 12:08:32 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/fontd_2015-02-27-120832_[redac ted].crash
    Feb 26, 2015, 08:19:12 AM    /Library/Logs/DiagnosticReports/WacomTabletDriver_2015-02-26-081912_[redacted]. crash
    Feb 27, 2015, 12:46:20 PM    Self test - passed

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