IMac freezes up and emits loud sound...

after running normaly for several hours, iMac freezes up, shows a blank screen, and emits an intermittent loud sound like a klaxon. it will not stop until I hold in the on/off button in for several seconds. after a few minutes of rest, iMac will restart normaly. this behavior reoccurs at several days intervals. Please help!
iMac 21.5 inch mid-2010
3.06 ghz intel core I3
8 Go 1333 mhz ddr3
mac os x v. 10.7.3
Yvon

Here is what I have...
1.   kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}'
com.squirrels.airparrot.framebuffer (3)
com.Greatdy.driver.SystemAudioCapture (1.0.0)
com.logmein.driver.LogMeInSoundDriver (1.0.0)
com.Cycling74.driver.Soundflower (1.5.2)
com.logmein.hamachi (1.0)
org.virtualbox.kext.VBoxDrv (4.1.8)
org.virtualbox.kext.VBoxUSB (4.1.8)
org.virtualbox.kext.VBoxNetFlt (4.1.8)
org.virtualbox.kext.VBoxNetAdp (4.1.8)
2.   sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix)|edu\.mit|org\.(amavis|apache|cups|isc|ntp|postfi x|x)/{print $3}'
Password:
com.wyse.PocketCloud
com.starfield.backupservice
gs-server
com.sharpcast.xfsmond
com.p5sys.jumpdesktop.service
com.microsoft.office.licensing.helper
com.micromat.TechToolProDaemon
com.logmein.raupdate
com.logmein.logmeinserver
com.logmein.hamachi
com.icyblaze.iDocumentHelper
com.google.keystone.daemon
com.adobe.SwitchBoard
com.adobe.fpsaud
3.    launchctl list | sed 1d | awk '!/0x|com\.apple|edu\.mit|org\.(x|openbsd)/{print $3}'
com.kodak.ShareButtonAgent
com.wyse.MacCompanion
com.p5sys.jumpdesktop.agent
com.micromat.TechToolProAgent
com.logmein.logmeinguiagent
com.logmein.logmeingui
com.logmein.hamachimb
com.google.keystone.system.agent
com.nchsoftware.inventoria.agent
com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae
com.adobe.AAM.Scheduler-1.0
4.     ls -1A /e*/mach* {,/}L*/{Ad,Compon,Ex,Fram,In,Keyb,La,Mail/Bu,P*P,Priv,Qu,Scripti,Servi,Spo,Sta} * L*/Fonts 2> /dev/null
/Library/Components:
/Library/Extensions:
VBoxDrv.kext
VBoxNetAdp.kext
VBoxNetFlt.kext
VBoxUSB.kext
ham.kext
/Library/Frameworks:
AEProfiling.framework
AERegistration.framework
Adobe AIR.framework
AudioMixEngine.framework
HPSmartPrint.framework
Mono.framework
NyxAudioAnalysis.framework
PluginManager.framework
SRFrameBufferConnection.framework
iLifeFaceRecognition.framework
iLifeKit.framework
iLifePageLayout.framework
iLifeSQLAccess.framework
iLifeSlideshow.framework
iTunesLibrary.framework
/Library/Input Methods:
/Library/InputManagers:
CTLoader
/Library/Internet Plug-Ins:
AdobePDFViewer.plugin
AdobePDFViewerNPAPI.plugin
Flash Player.plugin
JavaAppletPlugin.plugin
LogMeIn.plugin
LogMeInSafari32.plugin
LogMeInSafari64.plugin
NP_2020Player_IKEA.plugin
NP_2020Player_WEB.plugin
Quartz Composer.webplugin
QuickTime Plugin.plugin
SharePointBrowserPlugin.plugin
SharePointWebKitPlugin.webplugin
Silverlight.plugin
flashplayer.xpt
googletalkbrowserplugin.plugin
iPhotoPhotocast.plugin
npfoliopluginpu.plugin
npgtpo3dautoplugin.plugin
nsIQTScriptablePlugin.xpt
/Library/Keyboard Layouts:
/Library/LaunchAgents:
SBA_ListenerAgent.plist
com.adobe.AAM.Updater-1.0.plist
com.google.keystone.agent.plist
com.logmein.hamachimb.plist
com.logmein.logmeingui.plist
com.logmein.logmeinguiagent.plist
com.logmein.logmeinguiagentatlogin.plist
com.micromat.TechToolProAgent.plist
com.p5sys.jumpdesktop.agent.plist
com.wyse.MacCompanion.plist
/Library/LaunchDaemons:
com.adobe.SwitchBoard.plist
com.adobe.fpsaud.plist
com.google.keystone.daemon.plist
com.icyblaze.iDocumentHelper.plist
com.logmein.hamachi.plist
com.logmein.logmeinserver.plist
com.logmein.raupdate.plist
com.micromat.TechToolProDaemon.plist
com.microsoft.office.licensing.helper.plist
com.p5sys.jumpdesktop.service.plist
com.sharpcast.xfsmond.plist
com.siber.gs-server.plist
com.starfield.backupservice.plist
com.wyse.PocketCloud.plist
/Library/PreferencePanes:
Flash Player.prefPane
TechTool Protection.prefPane
/Library/PrivilegedHelperTools:
com.microsoft.office.licensing.helper
/Library/QuickLook:
GBQLGenerator.qlgenerator
iBooksAuthor.qlgenerator
iWork.qlgenerator
/Library/QuickTime:
AppleAVCIntraCodec.component
AppleHDVCodec.component
AppleIntermediateCodec.component
AppleMPEG2Codec.component
AppleProResCodec.component
DVCPROHDCodec.component
FCP Uncompressed 422.component
IMXCodec.component
/Library/ScriptingAdditions:
Adobe Unit Types.osax
/Library/Spotlight:
GBSpotlightImporter.mdimporter
LogicPro.mdimporter
Microsoft Office.mdimporter
iBooksAuthor.mdimporter
iWork.mdimporter
/Library/StartupItems:
VirtualBox
/etc/mach_init.d:
/etc/mach_init_per_login_session.d:
/etc/mach_init_per_user.d:
Library/Address Book Plug-Ins:
YMsgrCallABPlugin.bundle
YMsgrMsnABPlugin.bundle
YMsgrSmsABPlugin.bundle
YMsgrYimABPlugin.bundle
Library/Fonts:
APANRG__.TTF
ASans.ttf
ASansBOLD.ttf
ASansBlack.ttf
ASansreg.ttf
Archive.otf
BlackOpsOne.ttf
Brexia.otf
BrexiaBold.otf
BrexiaBoldItalic.otf
BrexiaCondBold.otf
BrexiaCondItalic.otf
BrexiaCondensed.otf
BrexiaExpBold.otf
BrexiaExpItalic.otf
BrexiaExpanded.otf
BrexiaItalic.otf
BrexiaNarBold.otf
BrexiaNarItalic.otf
BrexiaNarrow.otf
BrexiaOutline.otf
BrexiaWide.otf
BrexiaWideBold.otf
BrexiaWideItalic.otf
CODE Bold.otf
CODE Light.otf
Carton-Slab.otf
Dekar Light.otf
Dekar.otf
FV_Almelo.ttf
Facet Black.ttf
Facet Ultra.ttf
Florsn01.ttf
Florsn38.ttf
Florsn42.ttf
Florsn45.ttf
Florsn46.ttf
Flubber.ttf
FrancoisOne.ttf
Gota Light.otf
Gota.otf
Hagin Caps Medium.otf
Hagin Caps Thin.otf
Hero Light.otf
Hero.otf
Homestead-Display.otf
Homestead-Inline.otf
Homestead-One.otf
Homestead-Regular.otf
Homestead-Three.otf
Homestead-Two.otf
Intro Inline.otf
Intro.otf
Jura-Bold.ttf
Jura-BoldItalic.ttf
Jura-Italic.ttf
Jura-Regular.ttf
Kabel Light.otf
Kabel.otf
Lavanderia Delicate.otf
Lavanderia Regular.otf
Lavanderia Sturdy.otf
Maiandra GD Italic.ttf
Maiandra GD.ttf
NothingYouCouldDo.ttf
Otama-ep.otf
Parisienne-Regular.ttf
Poly-Italic.ttf
Poly-Regular.ttf
Quad Black.otf
Quad Light.otf
Quad Ultra.otf
RBNo2Light.otf
RBNo2Light_a.otf
Redressed.ttf
Rex Bold Inline.otf
Rex Bold.otf
Rex Light.otf
RockSalt.ttf
SAF.otf
Scruffy-Light.otf
Scruffy-Regular.otf
Socialico.otf
Static Bold Italic.otf
Static Bold.otf
Static Italic.otf
Static.otf
VAL Stencil.otf
Weston Free.otf
Weston Light Free.otf
apantasia.ttf
boston.ttf
orbitron-black.otf
orbitron-bold.otf
orbitron-light.otf
orbitron-medium.otf
Library/Input Methods:
.localized
Library/Internet Plug-Ins:
Google Earth Web Plug-in.plugin
WbeTools64_14.plugin
WebEx64.plugin
fileEditTool64_15.plugin
rf-firefox-plugin.plugin
rf-safari-plugin.webplugin
Library/Keyboard Layouts:
Library/LaunchAgents:
com.adobe.AAM.Updater-1.0.plist
com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae.plist
com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.ECA08935-6CBD-472D-B6B7-E5C 63BF63FB9.plist
[email protected]list
com.apple.FolderActions.enabled.plist
com.apple.FolderActions.folders.plist
com.apple.SafariBookmarksSyncer.plist
com.nchsoftware.inventoria.agent.plist
org.virtualbox.vboxwebsrv.plist
Library/PreferencePanes:
Library/ScriptingAdditions:
TextExpander Addition.osax
Library/Services:
Sync with MacDropAny.workflow
LimeWire/Incomplete:
5.    osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null
Cobook, Numi, iTunesHelper, PhoneViewHelper, DeskTime, AdobeResourceSynchronizer, TextExpander, WorkspaceUpdate, Fantastical, DriveMapReconnect, SimpleCap, Dropbox

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