HT3964 My iMac turns on and a white screen appears with the mac apple and the wheel just sits and spins for a long period of time. Any ideas?

My iMac turns on. A white screen appears, then a apple appears, then the wheel starts to turn but my computer never boots all the way on?

Please carefully read Apple's Gray screen appears during startup advice letter for steps on how to troubleshoot the issue.

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    (no debugging symbols found)
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    [Thread debugging using libthread_db enabled]
    [New Thread 0xb49d1720 (LWP 4160)]
    [New Thread 0xb23ffb90 (LWP 4162)]
    [New Thread 0xb2db2b90 (LWP 4161)]
    (no debugging symbols found)
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    [KCrash handler]
    #6 0x00000003 in ?? ()
    #7 0xb650ed14 in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
    #8 0xb5fa18d3 in QApplicationPrivate::notify_helper ()
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    #9 0xb5fa8fb2 in QApplication::notify () from /usr/lib/libQtGui.so.4
    #10 0xb7a90184 in KApplication::notify () from /usr/lib/libkdeui.so.5
    #11 0xb6b84a3a in QCoreApplication::notifyInternal ()
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    #12 0xb650f075 in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
    #13 0xb64ec598 in ?? () from /usr/lib/libQtGui.so.4
    #14 0xb64ecf74 in QGraphicsScene::setFocusItem () from /usr/lib/libQtGui.so.4
    #15 0xb64cc74e in QGraphicsItem::clearFocus () from /usr/lib/libQtGui.so.4
    #16 0xb650df03 in QGraphicsWidget::~QGraphicsWidget ()
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    #17 0xb7f8a89d in Plasma::Applet::~Applet () from /usr/lib/libplasma.so.2
    #18 0xb7fb30ea in Plasma::Containment::~Containment ()
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    #19 0xb31f9df6 in Panel::~Panel ()
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    #20 0xb7fbce4a in Plasma::Corona::~Corona () from /usr/lib/libplasma.so.2
    #21 0xb80a5b66 in DesktopCorona::~DesktopCorona ()
    from /usr/lib/libkdeinit4_plasma.so
    #22 0xb80b462e in PlasmaApp::cleanup () from /usr/lib/libkdeinit4_plasma.so
    #23 0xb80b7477 in PlasmaApp::qt_metacall ()
    from /usr/lib/libkdeinit4_plasma.so
    #24 0xb6b97ee5 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
    #25 0xb6b98bf9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
    #26 0xb6bcf78a in QCoreApplication::aboutToQuit ()
    from /usr/lib/libQtCore.so.4
    #27 0xb6b8588a in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
    #28 0xb5fa1784 in QApplication::exec () from /usr/lib/libQtGui.so.4
    #29 0xb80a94ae in kdemain () from /usr/lib/libkdeinit4_plasma.so
    #30 0x080487d6 in _start ()
    #0 0xb80c2424 in __kernel_vsyscall ()
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