Portege M400 randomly switching off and restarting

Hi,
I wondered if any one has any suggestions on what's wrong with my laptop? Two days ago it started randomly switching off and restarting. I've checked the following:
- Run Panda Security online check for viruses etc - all ok.
- Checked the system logs but all it records is a 'windows stopped unexpectedly' error.
- Suspecting an overheating problem I took it to pieces, cleaned all the dust from the fan and heat exchanger. Also cleaned all the old thermal compound off the CPU and replaced with new. It is now running much cooler but still randomly shutting down.
- Run a Suse Linux Live DVD to check it's definitely not an OS problem and it still shuts down.
I'm guessing something is shorting out on the motherboard as it will run ok if it's on a flat surface and not moved and I don't press down too hard whilst typing etc. Though it's a bit hit and miss. Has anyone had this problem before and is there any thing else I could try? Also any ideas on how much a new motherboard is? I'm expecting probably expensive :( Unless there's any kind of fix I can do myself? I'm pretty technically minded and don't have a problem with taking it to bits just don't know much about electronics, engines are more my thing :D
TIA, Firedrake
Ps Laptop model number is PPM40E running Vista Business.

Had a chat with a mate of mine and took it to bits again and have noticed that the heatsink that connects the CPU to the heat exchanger and fan isn't very well clamped even though the three screws are tight. It can be wiggled from side to side is this normal? Every CPU heatsink I've seen on desktops is very firmly clamped down and can't move at all. I'd have expect this to be the same on a laptop.
I've adjusted the clamp a bit and it's better then it was but still moves slightly. Now when it switches off the fan goes full blast and the DC IN LED is flashing orange but it doesn't reboot. According to the manual this is an overheating power down so I'm back to thinking it's an overheating CPU problem rather then the motherboard.
Has anyone else had this problem and know how to fix it? In the mean time I've ordered another heatsink to see if that solves it.
Cheers, Firedrake

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    System Software:
              OS X 10.9.2 (13C64) - Uptime: 0 days 6:22:39
    Disk Information:
              TOSHIBA MK7559GSXF disk0 : (750.16 GB)
                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) / [Startup]: 749.3 GB (357.93 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
              MATSHITADVD-R   UJ-8A8 
    USB Information:
              Apple Inc. FaceTime HD Camera (Built-in)
              Apple Inc. Apple Internal Keyboard / Trackpad
              Apple Inc. BRCM20702 Hub
                        Apple Inc. Bluetooth USB Host Controller
              Apple Computer, Inc. IR Receiver
    FireWire Information:
    Thunderbolt Information:
              Apple Inc. thunderbolt_bus
    Configuration files:
              /etc/hosts - Count: 44 - Corrupt!
    Launch Daemons:
              [System] com.adobe.fpsaud.plist 3rd-Party support link
              [System] com.adobe.SwitchBoard.plist 3rd-Party support link
              [System] com.microsoft.office.licensing.helper.plist 3rd-Party support link
              [System] org.eyebeam.SelfControl.plist 3rd-Party support link
    Launch Agents:
              [System] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
              [System] com.adobe.AdobeCreativeCloud.plist 3rd-Party support link
              [System] com.adobe.CS5ServiceManager.plist 3rd-Party support link
    User Launch Agents:
              [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
              [not loaded] com.adobe.ARM.[...].plist 3rd-Party support link
              [not loaded] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
              [not loaded] com.divx.agent.postinstall.plist 3rd-Party support link
              [not loaded] com.facebook.videochat.[redacted].plist 3rd-Party support link
              [not loaded] com.google.keystone.agent.plist 3rd-Party support link
              [not loaded] com.spotify.webhelper.plist 3rd-Party support link
    User Login Items:
              iTunesHelper
              Dropbox
              Android File Transfer Agent
    Internet Plug-ins:
              OVSHelper: Version: 1.1 3rd-Party support link
              Default Browser: Version: 537 - SDK 10.9
              AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 3rd-Party support link
              FlashPlayer-10.6: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
              AdobePDFViewerNPAPI: Version: 10.1.9 3rd-Party support link
              DivXBrowserPlugin: Version: 2.2 3rd-Party support link
              Flash Player: Version: 12.0.0.77 - SDK 10.6 Cannot contact Adobe
              QuickTime Plugin: Version: 7.7.3
              Silverlight: Version: 5.1.20913.0 - SDK 10.6 3rd-Party support link
              SharePointBrowserPlugin: Version: 14.1.0 3rd-Party support link
              AdobePDFViewer: Version: 10.1.9 3rd-Party support link
              JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
    Safari Extensions:
              DivX Plus Web Player HTML5 <video>: Version: 2.1.2.145
              AdBlock: Version: 2.5.45
              AdBlock: Version: 2.6.18
    Audio Plug-ins:
              BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
              AirPlay: Version: 2.0 - SDK 10.9
              AppleAVBAudio: Version: 203.2 - SDK 10.9
              iSightAudio: Version: 7.7.3 - SDK 10.9
    iTunes Plug-ins:
              Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
    3rd Party Preference Panes:
              DivX  3rd-Party support link
              Flash Player  3rd-Party support link
              Growl  3rd-Party support link
    Old Applications:
              None
    Time Machine:
              Time Machine not configured!
    Top Processes by CPU:
                  12%          WindowServer
                   4%          mds
                   3%          opendirectoryd
                   3%          Google Chrome
                   2%          coreaudiod
    Top Processes by Memory:
              205 MB          com.apple.IconServicesAgent
              147 MB          Finder
              131 MB          Google Chrome
              123 MB          VLC
              106 MB          softwareupdated
    Virtual Memory Information:
              516 MB          Free RAM
              1.43 GB          Active RAM
              1.40 GB          Inactive RAM
              676 MB          Wired RAM
              1.83 GB          Page-ins
              0 B          Page-outs

    Please read this whole message before doing anything.
    This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
    Step 1
    The purpose of this step is to determine whether the problem is localized to your user account.
    Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
    While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
    Test while logged in as Guest. Same problem?
    After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
    *Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
    Step 2
    The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
    Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
    Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
    Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Test while in safe mode. Same problem?
    After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

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