Why iMac early 2009 beep 3 times?

I want to upgrade the ram of my 24 inch iMac (early 2009. It currently has two PC3 DDR3 1066  2GB running it. I bought a pair of PC3 DDR3 1066 4GB as Apple suggests on its support page. Even though everything is it should, every time I install the new ones and try to start up my computer it makes three beeps. I've read that this is a hardware error but I am sure I have the right spects on new ones, what can I do?

Here is the correct RAM and specs for your early 2009 iMac.
http://eshop.macsales.com/shop/memory/iMac/DDR3_2009
Maximum Memory
8.0 GB
Memory Slots
2 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM

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    0xffffff80ee3cbee0 : 0xffffff800bc159fa
    0xffffff80ee3cbf00 : 0xffffff800bc1ad4d
    0xffffff80ee3cbf40 : 0xffffff800bc18edb
    0xffffff80ee3cbf70 : 0xffffff800bca5dd6
    0xffffff80ee3cbfb0 : 0xffffff800bccdd43
    BSD process name corresponding to current thread: GrowlHelperApp
    Mac OS version:
    12D78
    Kernel version:
    Darwin Kernel Version 12.3.0: Sun Jan  6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64
    Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6
    Kernel slide:     0x000000000ba00000
    Kernel text base: 0xffffff800bc00000
    System model name: iMac9,1 (Mac-F2218FA9)
    System uptime in nanoseconds: 8524868192710
    last loaded kext at 265295060056: com.apple.filesystems.msdosfs          1.8 (addr 0xffffff7f8ddda000, size 65536)
    last unloaded kext at 325721824096: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f8ddd7000, size 12288)
    loaded kexts:
    com.apple.filesystems.smbfs          1.8
    com.apple.filesystems.ntfs          3.10
    com.apple.driver.AGPM          100.12.87
    com.apple.driver.AudioAUUC          1.60
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AppleHDA          2.3.7fc4
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.kext.AMDFramebuffer          8.1.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3
    com.apple.driver.AppleMikeyDriver          2.3.7fc4
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleBacklight          170.2.5
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.ATIRadeonX2000          8.1.0
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.iokit.IOBluetoothSerialManager          4.1.3f3
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ApplePolicyControl          3.3.0
    com.apple.driver.AppleIRController          320.15
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.iokit.SCSITaskUserClient          3.5.5
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.driver.AppleUSBHub          5.5.5
    com.apple.driver.AppleUSBEHCI          5.5.0
    com.apple.driver.AppleFWOHCI          4.9.6
    com.apple.driver.AirPort.Brcm4331          614.20.16
    com.apple.driver.AppleAHCIPort          2.5.1
    com.apple.nvenet          2.0.19
    com.apple.driver.AppleUSBOHCI          5.2.5
    com.apple.driver.AppleEFINVRAM          1.7
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleACPIButtons          1.7
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.7
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
    com.apple.nke.applicationfirewall          4.0.39
    com.apple.security.quarantine          2
    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleUSBAudio          2.9.0f6
    com.apple.iokit.IOAudioFamily          1.8.9fc11
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.3f3
    com.apple.driver.AppleHDAController          2.3.7fc4
    com.apple.iokit.IOHDAFamily          2.3.7fc4
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleSMBusPCI          1.0.11d0
    com.apple.driver.IOPlatformPluginFamily          5.3.0d51
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.11d0
    com.apple.kext.AMD4800Controller          8.1.0
    com.apple.kext.AMDSupport          8.1.0
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.iokit.IOBluetoothFamily          4.1.3f3
    com.apple.driver.AppleSMC          3.1.4d2
    com.apple.driver.AppleGraphicsControl          3.3.0
    com.apple.iokit.IONDRVSupport          2.3.7
    com.apple.iokit.IOGraphicsFamily          2.3.7
    com.apple.driver.AppleUSBHIDKeyboard          170.2
    com.apple.driver.AppleHIDKeyboard          170.2
    com.apple.iokit.IOUSBHIDDriver          5.2.5
    com.apple.driver.AppleUSBMergeNub          5.5.5
    com.apple.driver.AppleUSBComposite          5.2.5
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.5
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.5.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
    com.apple.iokit.IOUSBUserClient          5.5.5
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IO80211Family          522.4
    com.apple.iokit.IOAHCIFamily          2.3.1
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.driver.NVSMU          2.2.9
    com.apple.iokit.IOUSBFamily          5.5.5
    com.apple.driver.AppleEFIRuntime          1.7
    com.apple.iokit.IOHIDFamily          1.8.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220.2
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          345
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.21
    com.apple.driver.AppleACPIPlatform          1.7
    com.apple.iokit.IOPCIFamily          2.7.3
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0

    Update: It just happened again, this time while doing a backup with Time Machine. Could it be my Keyboard?
    I'm not using a Bluetooth keyboard, but one with a USB connection. Sometimes I'm connecting my backup drive to it, but reboots also happen without anything connected to the keyboard.
    This time there's even backtrace info:
    Thu Apr 11 14:36:46 2013
    panic(cpu 1 caller 0xffffff8016cb7e95): Kernel trap at 0xffffff8016c87717, type 14=page fault, registers:
    CR0: 0x000000008001003b, CR2: 0xffffef8022834ca0, CR3: 0x0000000019889000, CR4: 0x0000000000000660
    RAX: 0xffffff8022818b00, RBX: 0xffffef8022834c70, RCX: 0x0000000000000000, RDX: 0x0000000000000310
    RSP: 0xffffff8024093690, RBP: 0xffffff80240936b0, RSI: 0x0000000000000000, RDI: 0xffffff803002ea80
    R8:  0xffffff8029adb058, R9:  0x0000000000002000, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
    R12: 0xffffff8024093790, R13: 0xffffff8029adb000, R14: 0xffffff803002ea80, R15: 0x0000000000000000
    RFL: 0x0000000000010202, RIP: 0xffffff8016c87717, CS:  0x0000000000000008, SS:  0x0000000000000010
    Fault CR2: 0xffffef8022834ca0, Error code: 0x0000000000000000, Fault CPU: 0x1
    Backtrace (CPU 1), Frame : Return Address
    0xffffff8024093330 : 0xffffff8016c1d626
    0xffffff80240933a0 : 0xffffff8016cb7e95
    0xffffff8024093570 : 0xffffff8016ccd4dd
    0xffffff8024093590 : 0xffffff8016c87717
    0xffffff80240936b0 : 0xffffff8016c83343
    0xffffff80240939d0 : 0xffffff8016f85e3e
    0xffffff8024093a20 : 0xffffff8016ce8c61
    0xffffff8024093aa0 : 0xffffff8016cdaf44
    0xffffff8024093ae0 : 0xffffff7f9720185b
    0xffffff8024093b30 : 0xffffff7f98e01f42
    0xffffff8024093b80 : 0xffffff7f98e059a6
    0xffffff8024093bd0 : 0xffffff7f972d2198
    0xffffff8024093c20 : 0xffffff7f972d2215
    0xffffff8024093c50 : 0xffffff7f98df17dd
    0xffffff8024093c80 : 0xffffff7f97514a98
    0xffffff8024093d50 : 0xffffff7f9761d5ea
    0xffffff8024093e10 : 0xffffff7f9761ecff
    0xffffff8024093eb0 : 0xffffff7f9761ed3f
    0xffffff8024093ed0 : 0xffffff7f97618f1b
    0xffffff8024093ef0 : 0xffffff80170467a8
    0xffffff8024093f30 : 0xffffff80170452aa
    0xffffff8024093f80 : 0xffffff80170453d9
    0xffffff8024093fb0 : 0xffffff8016cb2977
          Kernel Extensions in backtrace:
             com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000->0xffffff7f97222fff
             com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000->0xffffff7f9756cfff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9730f000
             com.apple.driver.AppleUSBEHCI(5.5)[220C65E6-AE76-38F5-88C5-B33FEC8E5061]@0xffff ff7f97615000->0xffffff7f9762cfff
                dependency: com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9730f000
             com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000->0xffffff7f972f7fff
             com.apple.iokit.IOUSBMassStorageClass(3.5.1)[30953382-7E86-3AEB-9485-A5621201C3 63]@0xffffff7f98def000->0xffffff7f98dfffff
                dependency: com.apple.iokit.IOUSBFamily(5.5.5)[A276B40E-978D-3623-93D3-8621B3CEECFC]@0xffff ff7f97511000
                dependency: com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000
                dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000
             com.apple.iokit.IOSCSIBlockCommandsDevice(3.5.5)[07B0BD1F-3970-3AA0-B55A-D0D7D6 5FFB60]@0xffffff7f98e00000->0xffffff7f98e14fff
                dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(3.5.5)[DCE95F6E-F7D4-33D8-9515-FB C4FF5B1AB4]@0xffffff7f972cd000
                dependency: com.apple.iokit.IOStorageFamily(1.8)[5BA4CD36-E96D-3A9E-ADFF-A863BBD63BC7]@0xff ffff7f971fe000
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    12D78
    Kernel version:
    Darwin Kernel Version 12.3.0: Sun Jan  6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64
    Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6
    Kernel slide:     0x0000000016a00000
    Kernel text base: 0xffffff8016c00000
    System model name: iMac9,1 (Mac-F2218FA9)
    System uptime in nanoseconds: 17790449382562
    last loaded kext at 11988722596011: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f98e15000, size 16384)
    last unloaded kext at 12049480700476: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f98e15000, size 12288)
    loaded kexts:
    com.apple.filesystems.smbfs          1.8
    com.apple.filesystems.ntfs          3.10
    com.apple.iokit.IOBluetoothSerialManager          4.1.3f3
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AGPM          100.12.87
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.AppleHDA          2.3.7fc4
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ApplePolicyControl          3.3.0
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleMikeyDriver          2.3.7fc4
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleBacklight          170.2.5
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.kext.AMDFramebuffer          8.1.0
    com.apple.ATIRadeonX2000          8.1.0
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.driver.AppleIRController          320.15
    com.apple.iokit.SCSITaskUserClient          3.5.5
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.driver.AppleUSBHub          5.5.5
    com.apple.driver.AppleFWOHCI          4.9.6
    com.apple.driver.AirPort.Brcm4331          614.20.16
    com.apple.driver.AppleAHCIPort          2.5.1
    com.apple.nvenet          2.0.19
    com.apple.driver.AppleEFINVRAM          1.7
    com.apple.driver.AppleUSBEHCI          5.5.0
    com.apple.driver.AppleUSBOHCI          5.2.5
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleACPIButtons          1.7
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.7
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
    com.apple.nke.applicationfirewall          4.0.39
    com.apple.security.quarantine          2
    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.5
    com.apple.iokit.IOUSBMassStorageClass          3.5.1
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.3f3
    com.apple.driver.AppleUSBAudio          2.9.0f6
    com.apple.iokit.IOAudioFamily          1.8.9fc11
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.driver.AppleHDAController          2.3.7fc4
    com.apple.iokit.IOHDAFamily          2.3.7fc4
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOBluetoothFamily          4.1.3f3
    com.apple.driver.AppleSMC          3.1.4d2
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleSMBusPCI          1.0.11d0
    com.apple.driver.IOPlatformPluginFamily          5.3.0d51
    com.apple.driver.AppleGraphicsControl          3.3.0
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.11d0
    com.apple.iokit.IONDRVSupport          2.3.7
    com.apple.kext.AMD4800Controller          8.1.0
    com.apple.kext.AMDSupport          8.1.0
    com.apple.iokit.IOGraphicsFamily          2.3.7
    com.apple.driver.AppleUSBHIDKeyboard          170.2
    com.apple.driver.AppleHIDKeyboard          170.2
    com.apple.iokit.IOUSBHIDDriver          5.2.5
    com.apple.driver.AppleUSBMergeNub          5.5.5
    com.apple.driver.AppleUSBComposite          5.2.5
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.5
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.5.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
    com.apple.iokit.IOUSBUserClient          5.5.5
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IO80211Family          522.4
    com.apple.iokit.IOAHCIFamily          2.3.1
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.iokit.IOUSBFamily          5.5.5
    com.apple.driver.NVSMU          2.2.9
    com.apple.driver.AppleEFIRuntime          1.7
    com.apple.iokit.IOHIDFamily          1.8.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220.2
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          345
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.21
    com.apple.driver.AppleACPIPlatform          1.7
    com.apple.iokit.IOPCIFamily          2.7.3
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0

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