Connect to 2 external displays using 2 thunderbolt to hdmi cables

I have a new iMac which has 2 thunderbolt ports.  I was told that I can add 2 displays using these ports with thunderbolt to hdmi cables.  However when I do this only one screen connects.  The other remains blank (and off).

Hello, I wonder if HDMI isn't the problem?
It's supposed to...
2nd Display Support:
Dual/Mirroring*
2nd Max. Resolution:
2560x1600 (x2)
Details:
*This model can simultaneously support two external displays up to 2560x1600 via Thunderbolt.
http://www.everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-27-inch-alumin um-late-2012-specs.html
Do the monitors have anything besides HDMI?

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    0xffffff81f8fe36e0 : 0xffffff800acdbf5e
    0xffffff81f8fe38b0 : 0xffffff800acf3456
    0xffffff81f8fe38d0 : 0xffffff800ac93f39
    0xffffff81f8fe3a10 : 0xffffff800acafdfe
    0xffffff81f8fe3a50 : 0xffffff800b0bb851
    0xffffff81f8fe3a90 : 0xffffff7f8c6e608d
    0xffffff81f8fe3af0 : 0xffffff7f8c70e24c
    0xffffff81f8fe3b30 : 0xffffff7f8c715fb2
    0xffffff81f8fe3b70 : 0xffffff7f8c715ddc
    0xffffff81f8fe3b90 : 0xffffff800b0cff0d
    0xffffff81f8fe3bf0 : 0xffffff800b0cdabf
    0xffffff81f8fe3d40 : 0xffffff800acb66a8
    0xffffff81f8fe3e50 : 0xffffff800ac26bf1
    0xffffff81f8fe3e80 : 0xffffff800ac139f5
    0xffffff81f8fe3ef0 : 0xffffff800ac1e043
    0xffffff81f8fe3f70 : 0xffffff800acc989d
    0xffffff81f8fe3fb0 : 0xffffff800acf3c76
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             com.apple.iokit.IOAcceleratorFamily2(98.20)[990E3F01-63C7-301C-83B2-40F786CA8F2 6]@0xffffff7f8c6e4000->0xffffff7f8c748fff
                dependency: com.apple.iokit.IOPCIFamily(2.9)[244D4E48-78E6-3369-8D76-285C66EF9BF4]@0xffffff 7f8b2be000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[B889D3AB-CCC0-3FCD-A83E-D2E3E4CB537B]@0 xffffff7f8bac1000
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    Kernel UUID: ADD73AE6-88B0-32FB-A8BB-4F7C8BE4092E
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    last unloaded kext at 427763147270: com.apple.filesystems.msdosfs          1.9 (addr 0xffffff7f8cc49000, size 57344)
    loaded kexts:
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleGraphicsDevicePolicy          3.5.26
    com.apple.driver.AppleHDA          2.6.1f2
    com.apple.iokit.IOBluetoothSerialManager          4.2.4f1
    com.apple.driver.AGPM          100.14.15
    com.apple.driver.ApplePlatformEnabler          2.0.9d1
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.AppleIntelHD5000Graphics          8.2.6
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.driver.AppleThunderboltIP          1.1.2
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.4f1
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleCameraInterface          4.26.0
    com.apple.driver.AppleIntelFramebufferAzul          8.2.6
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleHWAccess          1
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    com.apple.driver.AppleUSBCardReader          3.4.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.driver.AppleUSBHub          666.4.0
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.5.1
    com.apple.driver.AppleAHCIPort          3.0.0
    com.apple.driver.AirPort.Brcm4360          831.21.63
    com.apple.driver.AppleUSBXHCI          677.4.0
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.1
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.6.1f2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.7fc2
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.iokit.IOSurface          91.1
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.4f1
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.driver.IOPlatformPluginFamily          5.7.0d11
    com.apple.AppleGraphicsDeviceControl          3.5.26
    com.apple.iokit.IOAcceleratorFamily2          98.20
    com.apple.driver.AppleHDAController          2.6.1f2
    com.apple.iokit.IOHDAFamily          2.6.1f2
    com.apple.iokit.IOBluetoothFamily          4.2.4f1
    com.apple.driver.AppleSMC          3.1.8
    com.apple.driver.AppleGraphicsControl          3.5.26
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.iokit.IONDRVSupport          2.4.1
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.iokit.IOGraphicsFamily          2.4.1
    com.apple.driver.AppleUSBMultitouch          240.9
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.6
    com.apple.iokit.IOUSBMassStorageClass          3.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.6
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.iokit.IOUSBHIDDriver          660.4.0
    com.apple.driver.AppleUSBComposite          656.4.1
    com.apple.driver.AppleThunderboltDPInAdapter          3.1.7
    com.apple.driver.AppleThunderboltDPAdapterFamily          3.1.7
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.5
    com.apple.iokit.IOUSBUserClient          660.4.2
    com.apple.iokit.IOAHCIFamily          2.6.5
    com.apple.driver.AppleThunderboltNHI          2.0.1
    com.apple.iokit.IOThunderboltFamily          3.2.7
    com.apple.iokit.IO80211Family          630.35
    com.apple.driver.mDNSOffloadUserClient          1.0.1b5
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBFamily          677.4.0
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          278.11
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          23
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.9
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    com.apple.kec.pthread          1
    Model: MacBookPro11,2, BootROM MBP112.0138.B07, 4 processors, Intel Core i7, 2 GHz, 16 GB, SMC 2.18f10
    Graphics: Intel Iris Pro, Intel Iris Pro, Built-In
    Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x134), Broadcom BCM43xx 1.0 (6.30.223.154.63)
    Bluetooth: Version 4.2.4f1 13674, 3 services, 23 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en0
    Serial ATA Device: APPLE SSD SM0256F, 251 GB
    USB Device: Internal Memory Card Reader
    USB Device: Apple Internal Keyboard / Trackpad
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: USB Receiver
    Thunderbolt Bus: MacBook Pro, Apple Inc., 17.1

    Hey SreeHarsha Vardhan,
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    http://support.apple.com/kb/HT1573
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