Macbook Pro won't start most of the time; freezes constantly.

I always come to these forums for answers and I've always found them, so I thank you in advance for everything you do. Unfortunately, I can't find an answer for this one...
My Macbook Pro 13" (early 2008?, maybe mid-2008?) had a weird thing happen this morning where a whole bunch of applications froze up. I could still move the mouse, though. It got so bad that I just shut my computer down by holding the power button. When I tried to restart, it came up with a gray screen and nothing happened. Then I tried it again, and it couldn't find the startup directory (folder with question mark). I then restarted the computer and held down option, specifying the start-up directory as the hard drive. It accepted the command, but didn't start up, so I was forced to power it down again. I then tried to repeat this, but when I pressed the option key just after start-up, it just shut down immediately. This happened several times.
Some hours later I got the computer to start up again after using the restore disk (option, then select), and reinstalling Mavericks. I was able to run disk utility, which showed no problems with the hard drive. I looked at console and I'm getting constant error messages for a variety of reasons:
2014-05-18 17:03:24 -0700 kernel[0]: SMC::smcReadKeyAction ERROR F1Mn kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff8022fc0000
2014-05-18 17:03:29 -0700 kernel[0]: SMC::smcReadKeyAction ERROR F1Mn kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff8022fc0000
Note: The above smcReadKeyAction ERROR comes up basically every 5 seconds
2014-05-18 17:03:03 -0700 com.apple.launchd.peruser.501[228]: Throttling respawn: Will start in 10 seconds
This one also comes up all the time.
error=Error Domain=AOSErrorDomain Code=5002 "The operation couldn’t be completed. (AOSErrorDomain error 5002.)" UserInfo=0x7f8f9bd256c0 {HttpStatusCode=401, DialogInfo={
    AlternateButtonLabel = "";
    AlternateButtonLink = "";
    Body = UNAUTHORIZED;
    DefaultButtonLabel = "mme.setupservice.SetupServiceJS.OK";
    DefaultButtonLink = "";
    DialogType = PasswordDialog;
    ErrorID = UNAUTHORIZED;
    Header = "";
    HelpLink = "";
    description = "These account credentials are unauthorized.";
    localizedError = UNAUTHORIZED;
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
This one's much longer but I didn't want to post too much text.
2014-05-18 16:39:12 -0700 WindowServer[150]: disable_update_timeout: UI updates were forcibly disabled by application "SystemUIServer" for over 1.00 seconds. Server has re-enabled them.
2014-05-18 16:39:12 -0700 Console[252]: setPresentationOptions called with NSApplicationPresentationFullScreen when there is no visible fullscreen window; this call will be ignored.
2014-05-18 16:39:13 -0700 xpcproxy[277]: assertion failed: 13D65: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
2014-05-18 16:39:14 -0700 kernel[0]: SMC::smcReadKeyAction ERROR F1Mn kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff8022fc0000
2014-05-18 16:39:15 -0700 WindowServer[150]: common_reenable_update: UI updates were finally reenabled by application "SystemUIServer" after 4.45 seconds (server forcibly re-enabled them after 1.00 seconds)
2014-05-18 16:39:15 -0700 WindowServer[150]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
2014-05-18 16:39:18 -0700 SystemUIServer[256]: Cannot find executable for CFBundle 0x7fe59b4ae3c0 </System/Library/CoreServices/Menu Extras/Clock.menu> (not loaded)
2014-05-18 16:39:18 -0700 WindowServer[150]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 3.40 seconds (server forcibly re-enabled them after 1.00 seconds)
And that one happened on startup.
I'm running the computer right now, and nothing has gone wrong, yet. Of course, the error messages are still there, so I don't think anything has changed, I'm just trying to run as few applications as possible and I'm only on this website.
I ran EtreCheck also:
Hardware Information:
          MacBook Pro (13-inch, Mid 2009)
          MacBook Pro - model: MacBookPro5,5
          1 2.26 GHz Intel Core 2 Duo CPU: 2 cores
          4 GB RAM
Video Information:
          NVIDIA GeForce 9400M - VRAM: 256 MB
System Software:
          OS X 10.9.3 (13D65) - Uptime: 0 days 0:11:21
Disk Information:
          Hitachi HTS545016B9SA02 disk0 : (160.04 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 159.18 GB (32.18 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          HL-DT-ST DVDRW  GS23N 
USB Information:
          Apple Inc. Built-in iSight
          Apple Internal Memory Card Reader
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information:
Gatekeeper:
          Mac App Store and identified developers
Kernel Extensions:
          [not loaded] com.NovatelWireless.driver.NovatelWirelessUSBCDCECMControl (3.0.13) Support
          [not loaded] com.NovatelWireless.driver.NovatelWirelessUSBCDCECMData (3.0.13) Support
          [not loaded] com.ZTE.driver.ZTEUSBCDCACMData (1.3.8) Support
          [not loaded] com.ZTE.driver.ZTEUSBMassStorageFilter (1.3.8) Support
          [not loaded] com.logmein.driver.LogMeInSoundDriver (1.0.0) Support
          [not loaded] com.novamedia.driver.IceraUSB_MSD_Bypass (1.3.0) Support
          [not loaded] com.novatelwireless.driver.3G (3.0.13) Support
          [not loaded] com.novatelwireless.driver.3GData (3.0.13) Support
          [not loaded] com.novatelwireless.driver.DisableAutoInstall (3.0.13) Support
          [not loaded] com.option.driver.Option72 (2.15.0) Support
          [not loaded] com.option.driver.OptionHS (3.26.0) Support
          [not loaded] com.option.driver.OptionMSD (1.21.0) Support
          [not loaded] com.option.driver.OptionQC (1.11.0) Support
          [not loaded] com.vodafone.driver (3.0.9) Support
          [not loaded] com.vodafone.driver.Data (3.0.9) Support
          [not loaded] com.zte.driver.cdc_ecm_qmi (1.0.1) Support
          [not loaded] com.zte.driver.cdc_usb_bus (1.0.1) Support
          [not loaded] de.novamedia.driver.NMSmartplugSCSIDevice (1.0.1) Support
          [not loaded] de.novamedia.driver.NMUSBCDCACMData.VTP (3.2.6) Support
          [not loaded] de.novamedia.oem.vodafone.vtp.huawei.cdc (0.0.2) Support
Startup Items:
          FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
          HWNetMgr: Path: /Library/StartupItems/HWNetMgr
          HWPortDetect: Path: /Library/StartupItems/HWPortDetect
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist Support
          [loaded] com.google.keystone.daemon.plist Support
          [not loaded] com.logmein.logmeinserver.plist Support
Launch Agents:
          [loaded] com.google.keystone.agent.plist Support
          [loaded] com.hp.help.tocgenerator.plist Support
          [failed] com.logmein.logmeingui.plist Support
          [not loaded] com.logmein.logmeinguiagent.plist Support
          [not loaded] com.logmein.logmeinguiagentatlogin.plist Support
          [not loaded] de.novamedia.VodafoneDeviceObserver.plist Support
User Launch Agents:
          [failed] [email protected]
          [loaded] com.divx.agent.postinstall.plist Support
          [failed] com.mlbam.nexdef.plist Support
User Login Items:
          iTunesHelper
          Skype
          Dropbox
Internet Plug-ins:
          o1dbrowserplugin: Version: 5.3.1.18536 Support
          OVSHelper: Version: 1.1 Support
          Default Browser: Version: 537 - SDK 10.9
          Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 Support
          OfficeLiveBrowserPlugin: Version: 12.3.0 Support
          Silverlight: Version: 5.1.20125.0 - SDK 10.6 Support
          FlashPlayer-10.6: Version: 13.0.0.214 - SDK 10.6 Support
          DivXBrowserPlugin: Version: 2.2 Support
          Flash Player: Version: 13.0.0.214 - SDK 10.6 Support
          QuickTime Plugin: Version: 7.7.3
          iPhotoPhotocast: Version: 7.0
          AdobePDFViewer: Version: Unknown
          DirectorShockwave: Version: 11.6.4r634 Support
Safari Extensions:
          Ebay Shopping Assistant: Version: 1.1
          Amazon Shopping Assistant: Version: 1.1
          Slick Savings: Version: 2.0
          DivX Plus Web Player HTML5 <video>: Version: 2.1.2.145
          Searchme: Version: 1.3
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:
          Eyephedrine: Version: (null) Support
          iVisualize: Version: 1.5
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User iTunes Plug-ins:
          TuneUp Visualizer: Version: (null) Support
User Internet Plug-ins:
          CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
          Move-Media-Player: Version: npmnqmp 071705000010 Support
3rd Party Preference Panes:
          DivX  Support
          Fan Control  Support
          Flash Player  Support
          Flip4Mac WMV  Support
          Perian  Support
Time Machine:
          Skip System Files: NO
          Auto backup: NO - Auto backup turned off
          Time Machine not configured!
Top Processes by CPU:
               7%          mds
               4%          Console
               3%          WindowServer
               0%          fontd
               0%          Dropbox
Top Processes by Memory:
          143 MB          com.apple.IconServicesAgent
          98 MB          mds_stores
          94 MB          softwareupdated
          78 MB          Dropbox
          66 MB          Finder
Virtual Memory Information:
          531 MB          Free RAM
          1.48 GB          Active RAM
          1.27 GB          Inactive RAM
          493 MB          Wired RAM
          1.59 GB          Page-ins
          0 B          Page-outs
I get the sense that there's a lot of crap on this computer that I ought to get rid of, but I'm not sure if this is causing the problem.
Also, I just installed 10.9.3 yesterday.
Thanks again for any help you can provide!

Well, the computer stopped starting up at all. It could never find the operating system. I tried safe mode and virtually every other non-standard start-up option. I then did target disk mode with another MBP and got the message: "The disk you inserted was not readable by this computer." I then tried using disk utility and it couldn't retrieve retrieve the data using restore (writing to an external drive). I suspect that this means the hard drive would need to be replaced. In your expert opinions, is this necessarily true? Could this still be just a software problem, or perhaps some other piece of hardware?
Part of the reason I ask is that this laptop is now nearly five years old. It's needed a new battery for two years. If it's a virtual certainty that the hard drive is toast, I don't want to pay $150 for someone to take it out and try to recover any remaining data from it, only to reveal that the data is indeed irretrievable (since the computer itself is probably only worth $300-400 at this point). The nearest Genius Bar is also more than 2 hours away. Am I going about this the right way by using disk utility, given that the hard drive won't mount to the desktop of the other computer? If the hard drive can't be reat in target disk mode, does that confirm that it is the hard drive?
Thanks
Oh also, it does still make the startup noise, even though I can't run the AHT since I can't get it to start up in safemode. I thought this mean that it passing various hardware tests. Does this not apply to the hard drive?
Message was edited by: Euain_ *add-on*

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    Step 11
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    Step 12
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    Message was edited by: Klapschaats

    Just google Nvidia 8600m, and problem, or oh god my screen is dead, and see what comes up.
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    <Edited by Moderator>

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