Why does my iMac (with Mountain Lion) no longer recognize my external hard drive I have used as a back up via Time Machine after the hard drive was accidentally unplugged?

Why does my iMac (with Mountain Lion) no longer recognize my external hard drive I have used as a back up via Time Machine after the hard drive was accidentally unplugged?

Do you mean the external hard drive is not mounted on the iMac desktop?
Check if Disk Utility sees the drive. Applications / Utilities / Disk Utility. If the external shows up in the left column, select it and click on Mount.
If it does show up this way, I recommend using DU to Repair Disk.

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    Anonymous UUID:                    17D8F909-09A9-4BC6-A153-A12F75529506
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    0xffffff8078713b90 : 0xffffff80002c4794
    0xffffff8078713d40 : 0xffffff80002da55d
    0xffffff8078713d60 : 0xffffff80002b4b31
    0xffffff8078713eb0 : 0xffffff80002352a5
    0xffffff8078713ec0 : 0xffffff800036489d
    0xffffff8078713ee0 : 0xffffff8000345031
    0xffffff8078713fb0 : 0xffffff8000820057
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    Kernel version:
    Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
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    last unloaded kext at 215848970782: com.apple.driver.AppleFileSystemDriver          13 (addr 0xffffff7f825c2000, size 12288)
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    com.vmware.kext.vmioplug          3.0.0
    com.vmware.kext.vmci          3.0.0
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    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
    com.apple.driver.AudioAUUC          1.59
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.GeForce          7.3.2
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleHDA          2.2.5a5
    com.apple.driver.AppleMikeyDriver          2.2.5a5
    com.apple.driver.AGPM          100.12.75
    com.apple.driver.AppleBacklight          170.2.2
    com.apple.driver.AppleMCCSControl          1.0.33
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.3
    com.apple.driver.ApplePolicyControl          3.1.33
    com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
    com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
    com.apple.driver.AppleIRController          312
    com.apple.driver.AppleUSBCardReader          3.0.6
    com.apple.iokit.SCSITaskUserClient          3.2.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          33
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCISerialATAPI          2.0.3
    com.apple.iokit.IOAHCIBlockStorage          2.1.0
    com.apple.driver.AppleAHCIPort          2.3.1
    com.apple.nvenet          2.0.17
    com.apple.driver.AppleUSBHub          5.1.0
    com.apple.driver.AirPort.Atheros40          505.67.1
    com.apple.driver.AppleUSBEHCI          5.1.0
    com.apple.driver.AppleUSBOHCI          5.1.0
    com.apple.driver.AppleEFINVRAM          1.6.1
    com.apple.driver.AppleFWOHCI          4.9.0
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.7
    com.apple.driver.AppleACPIButtons          1.5
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.5
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
    com.apple.nke.applicationfirewall          3.2.30
    com.apple.security.quarantine          1.4
    com.apple.security.TMSafetyNet          8
    com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard          160.7
    com.apple.driver.AppleHIDKeyboard          160.7
    com.apple.driver.AppleMultitouchDriver          231.4
    com.apple.driver.IOBluetoothHIDDriver          4.0.8f17
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.nvidia.nv50hal          7.3.2
    com.apple.NVDAResman          7.3.2
    com.apple.driver.DspFuncLib          2.2.5a5
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.driver.AppleHDAController          2.2.5a5
    com.apple.iokit.IOHDAFamily          2.2.5a5
    com.apple.iokit.IOSurface          80.0.2
    com.apple.iokit.IOAudioFamily          1.8.6fc18
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleGraphicsControl          3.1.33
    com.apple.iokit.IONDRVSupport          2.3.4
    com.apple.iokit.IOGraphicsFamily          2.3.4
    com.apple.driver.AppleSMC          3.1.3d10
    com.apple.driver.IOPlatformPluginLegacy          5.0.0d8
    com.apple.driver.IOPlatformPluginFamily          5.1.1d6
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
    com.apple.iokit.IOBluetoothFamily          4.0.8f17
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1
    com.apple.iokit.IOUSBMassStorageClass          3.0.3
    com.apple.driver.AppleUSBMergeNub          5.1.0
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
    com.apple.iokit.IOAHCIFamily          2.0.8
    com.apple.iokit.IOUSBUserClient          5.0.0
    com.apple.iokit.IO80211Family          420.3
    com.apple.iokit.IONetworkingFamily          2.1
    com.apple.iokit.IOUSBFamily          5.1.0
    com.apple.driver.NVSMU          2.2.9
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOFireWireFamily          4.4.8
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          177.8
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          331.7
    com.apple.iokit.IOStorageFamily          1.7.2
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.5
    com.apple.iokit.IOPCIFamily          2.7
    com.apple.iokit.IOACPIFamily          1.4
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    Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
    Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
    AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
    Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
    Network Service: AirPort, AirPort, en1
    Serial ATA Device: ST3500418ASQ, 500.11 GB
    Serial ATA Device: OPTIARC DVD RW AD-5680H
    USB Device: Ext HDD 1021, 0x1058  (Western Digital Technologies, Inc.), 0x1021, 0x24300000 / 3
    USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 2
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 3
    USB Device: hub_device, 0x0409  (NEC Corporation), 0x0059, 0x26400000 / 2
    USB Device: Tablet, 0x172f, 0x0037, 0x26410000 / 6
    USB Device: Mass Storage Device, 0x058f  (Alcor Micro, Corp.), 0x6362, 0x26430000 / 5
    USB Device: USB 2.0 Hub [MTT], 0x1a40  (TERMINUS TECHNOLOGY INC.), 0x0101, 0x26440000 / 4
    USB Device: JumpDrive, 0x05dc  (Lexar Media, Inc.), 0xa205, 0x26441000 / 7
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 4

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