USB port at back of iMac stopped working except keyboard. Why?

My USB ports on back of iMac stopped working, I can't seem to get any power from them. Only keyboard port works..
My externals don't work neither and I got all my hard work on them. I think I've lost info?

I have no idea what happened. However, I believe that you've got to take it back to the service provider and work with them. Call them and tell them what happened and see what kind of a response you get. You might want to try to get in touch with Apple Customer Service and see if they can help you out with the service provider.
As for "compensation", that is probably a legal matter unless you have some kind of insurance that covers you for business losses. You might try to stress to the service provider that they should do whatever service is now needed to get the machine working again at no additional charge.

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com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f89c83000             dependency: com.apple.iokit.IO80211Family(530.4)[E86BEE31-8EE0-34BE-A53F-2571D85CC628]@0xff ffff7f8a43e000             dependency: com.apple.iokit.IONetworkingFamily(3.0)[F02560D1-ADE6-3AD9-8D05-43CB2B7C8B87]@0 xffffff7f89ddc000  BSD process name corresponding to current thread: kernel_task  Mac OS version: 12E55  Kernel version: Darwin Kernel Version 12.4.0: Wed May  1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36 Kernel slide:     0x0000000009400000 Kernel text base: 0xffffff8009600000 System model name: iMac10,1 (Mac-F2268DC8)  System uptime in nanoseconds: 397672779228 last loaded kext at 256566570174: com.apple.filesystems.msdosfs     1.8.1 (addr 0xffffff7f8b624000, size 65536) last unloaded kext at 363393284081: com.apple.filesystems.msdosfs     1.8.1 (addr 0xffffff7f8b624000, size 57344) loaded kexts: com.apple.filesystems.smbfs     1.8.4 com.apple.driver.AudioAUUC     1.60 com.apple.driver.AppleHDA     2.3.7fc4 com.apple.driver.AppleMikeyHIDDriver     122 com.apple.driver.AGPM     100.12.87 com.apple.driver.AppleHWSensor     1.9.5d0 com.apple.driver.AppleUpstreamUserClient     3.5.10 com.apple.kext.AMDFramebuffer     8.1.2 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     8.1.2 com.apple.iokit.IOUserEthernet     1.0.0d1 com.apple.iokit.IOBluetoothSerialManager     4.1.4f2 com.apple.Dont_Steal_Mac_OS_X     7.0.0 com.apple.driver.ApplePolicyControl     3.4.5 com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport     4.1.4f2 com.apple.filesystems.autofs     3.0 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.AppleUSBCardReader     3.1.7 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.Atheros40     600.72.2 com.apple.driver.AppleRTC     1.5 com.apple.driver.AppleAHCIPort     2.5.2 com.apple.nvenet     2.0.19 com.apple.driver.AppleUSBEHCI     5.5.0 com.apple.driver.AppleUSBOHCI     5.2.5 com.apple.driver.AppleEFINVRAM     1.7 com.apple.driver.AppleHPET     1.8 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     2.1 com.apple.driver.AppleIntelCPUPowerManagement     196.0.0 com.apple.driver.DspFuncLib     2.3.7fc4 com.apple.iokit.IOAudioFamily     1.8.9fc11 com.apple.kext.OSvKernDSPLib     1.6 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.AMD4600Controller     8.1.2 com.apple.kext.AMDSupport     8.1.2 com.apple.iokit.IOSurface     86.0.4 com.apple.iokit.IOSerialFamily     10.0.6 com.apple.iokit.IOBluetoothFamily     4.1.4f2 com.apple.driver.AppleGraphicsControl     3.4.5 com.apple.iokit.IONDRVSupport     2.3.7 com.apple.iokit.AppleBluetoothHCIControllerUSBTransport     4.1.4f2 com.apple.kext.triggers     1.0 com.apple.iokit.IOFireWireIP     2.2.5 com.apple.driver.AppleSMC     3.1.4d2 com.apple.driver.AppleHDAController     2.3.7fc4 com.apple.iokit.IOGraphicsFamily     2.3.7 com.apple.iokit.IOHDAFamily     2.3.7fc4 com.apple.iokit.IOUSBHIDDriver     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.IOSCSIBlockCommandsDevice     3.5.5 com.apple.iokit.IOUSBMassStorageClass     3.5.1 com.apple.driver.AppleUSBMergeNub     5.5.5 com.apple.driver.AppleUSBComposite     5.2.5 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     530.4 com.apple.iokit.IOAHCIFamily     2.3.1 com.apple.iokit.IONetworkingFamily     3.0 com.apple.iokit.IOUSBFamily     5.6.0 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     220.3 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 Model: iMac10,1, BootROM IM101.00CC.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.53f13 Graphics: ATI Radeon HD 4670, ATI Radeon HD 4670, PCIe, 256 MB Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631 Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631 AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.72.0-P2P Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports Network Service: Ethernet, Ethernet, en0 Network Service: AirPort, AirPort, en1 Serial ATA Device: Hitachi HDE721010SLA330, 1 TB Serial ATA Device: HL-DT-ST DVDRW  GA11N USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 2 USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 2 USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 4 USB Device: USB Keyboard, 0x04f2  (Chicony Electronics Co., Ltd.), 0x0111, 0x04300000 / 3 USB Device: Microsoft Notebook Optical Mouse with Tilt Wheel, 0x045e  (Microsoft Corporation), 0x00d2, 0x04100000 / 2 USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2 USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 3

    That panic was not caused by third-party software. If the problem is recurrent, the possibilities are:
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  • USB port not responding on iMac

    First - On my iMac (running OS X 10.7.5), I periodically will lose the functionality of 1 of my 3 USB ports on the back of the Mac.
    The only thing that seems to work is to restart the iMac.  But, this is only a work around.  Why would the USB just randomly fail?
    Second - On a related note, I do have a USB expansion hub that ONLY works with an external hard drive.  Whenever I try to use it for my iPhone, iPod, Neat scanner, or whatever, I get the pop-up window stating that there is not enough power for device that was plugged in and that I must use the USB on the back (which may or may not work in the first place).  Any suggestions on a product that WOULD work as a successful USB expansion?  Thank you.

    1. The port overload protection is tripping off because it was overloaded.
    2. Get a self-powered USB Hub instead of using that bus-powered Hub.
    Below are a couple examples of Belkin self-powered Hubs
    Hi-Speed USB 2.0 4-Port Hub | Other Hubs | Hubs | Macbook & PC | Products | Belkin
    Amazon.com: Belkin Hi-Speed USB 2.0 7-Port Hub F5U237-APL-S: Electronics

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