might be a power USB issue try to uinplug one and if the others are working then its a power issue.
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Thor/i7x970/ASUSR3E/GTX580/GSkill1600 8gb/WIN7x64/32 inch lcd||2*Lilliput's 7"||1*Double-sight DS-90U 9"||CB 7.1 Xtrem titanium pci express
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