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no USB power

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Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Pentium(R) Dual-Core CPU E5400 @ 2.70GHz, Intel64 Family 6 Model 23 Stepping 10
Processor Count: 2
RAM: 4060 Mb
Graphics Card: Intel(R) G41 Express Chipset, 1806 Mb
Hard Drives: C: Total - 461899 MB, Free - 321326 MB;
Motherboard: Dell Inc., 0J190T
Antivirus: AVG Anti-Virus Free Edition 2013, Updated and Enabled

My computer has been operating for the last 12 months with no apparent problems. Now however all my USB ports have lost power, they operate a printer, mouse, keyboard but will not recognise my storage devices. I have tried a restore, update of windows drivers,
Can any body help?

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