IMac shuts down automatically

An imac(2009) has been acting weird for almost a year already.
Here's the problem:
the system would shut down itself automatically, the screen going into a quick flash and the imac is power off unexpectedly. However, the problem only happens when you're using iMac. If I just let iMac open without using it (Ex; internet, or apps whatever), then nothing would happen.
My dad once took iMac to the reseller store in order to solve the problem, but the tester said everything were going right. And the problem has been perplexing me for a long time, just want to know is there anyone has an idea for me to deal with it.
P.S. And the problem seems have nothing to do with the version of system. From 10.6 to 10.8, the problem still happens.

Open console in Applications>Utilities, check the system log for the date/time of the last problem & the Startup right after that for clues.
What all is connected at home that wouldn't be at the reseller?
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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WebLogic server is shut down automatically

          After i install weblogic6.1 and run default server, I got the fowllowing message
          and then server is shut down automatically, I tried it days before, and it works,
          why not work now?
          Thanks in advance!
          moonriver
          <Nov 6, 2001 11:40:53 PM EST> <Notice> <Management> <Starting discovery of Managed
          Server... This feature is on by default, you may turn this off by passing -Dweblogic.management.discover=false>
          <Nov 6, 2001 11:40:58 PM EST> <Notice> <Management> <Application Poller not started
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          <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <Unable to create a
          server socket for port: 7002. java.net.BindException: Address in use: JVM_Bind
          Perhaps another process is using port 7002.>
          <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <The WebLogic Server
          is no longer listening for connections. You should probably restart it.>
          <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <Server shutdown has been
          requested by system>
          <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <The shutdown sequence
          has been initiated.>
          <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <Unable to create a
          server socket for port: 7001. java.net.BindException: Address in use: JVM_Bind
          Perhaps another process is using port 7001.>
          <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <Server shutdown has been
          requested by system>
          <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <The shutdown sequence
          has been initiated.>
          <Nov 6, 2001 11:41:58 PM EST> <Notice> <WebLogicServer> <Started WebLogic AdminServer
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Most likely you have another WebLogic instance already listening on 7001.
          Moonriver Sun <[email protected]> wrote:
          > After i install weblogic6.1 and run default server, I got the fowllowing message
          > and then server is shut down automatically, I tried it days before, and it works,
          > why not work now?
          > Thanks in advance!
          > moonriver
          > -----------------
          > <Nov 6, 2001 11:40:53 PM EST> <Notice> <Management> <Starting discovery of Managed
          > Server... This feature is on by default, you may turn this off by passing -Dweblogic.management.discover=false>
          > <Nov 6, 2001 11:40:58 PM EST> <Notice> <Management> <Application Poller not started
          > for production server.>
          > <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <Unable to create a
          > server socket for port: 7002. java.net.BindException: Address in use: JVM_Bind
          > Perhaps another process is using port 7002.>
          > <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <The WebLogic Server
          > is no longer listening for connections. You should probably restart it.>
          > <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <Server shutdown has been
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          > <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <The shutdown sequence
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          > <Nov 6, 2001 11:40:58 PM EST> <Emergency> <WebLogicServer> <Unable to create a
          > server socket for port: 7001. java.net.BindException: Address in use: JVM_Bind
          > Perhaps another process is using port 7001.>
          > <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <Server shutdown has been
          > requested by system>
          > <Nov 6, 2001 11:40:58 PM EST> <Alert> <WebLogicServer> <The shutdown sequence
          > has been initiated.>
          > <Nov 6, 2001 11:41:58 PM EST> <Notice> <WebLogicServer> <Started WebLogic AdminServer
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          Dimitri

IMac shuts down automatically

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