IMac freezes + Alarm sounds off ??

I have an imac 21" approx 6 months old. Occasionaly freezes and a beeping sound like an alarm sounds off and does not stop. Only way to resolve is to turn off my imac and back on again. Anyone has any idea, by the way I'm new to macs.

My iMac has just started doing this after I installed two 2GB RAM. I guess it isn't compatible. ?? How do I know if it is compatible ..where do I look etc? I am fairly computer illiterate.
Model Name:    iMac
Model Identifier:    iMac11,2
Processor Name:    Intel Core i3
Processor Speed:    3.06 GHz
Number Of Processors:    1
Total Number Of Cores:    2
L2 Cache (per core):    256 KB
L3 Cache:    4 MB
Memory:    8 GB
Processor Interconnect Speed:    5.86 GT/s
Boot ROM Version:    IM112.0057.B00
SMC Version (system):    1.64f5

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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
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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:
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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:
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My speakers pop and imac freezes whenever i play sound. help?

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http://support.apple.com/kb/HT1547
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A usually very happy iMac user who is very disgruntled these days...
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IMac freezes + Alarm sounds off ??

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