52 | TroubleshootingUniversal Serial Bus (USB) Specific ProblemsSpecificSymptomsWhat YouExperiencePossible SolutionsUSB interface isnot workingUSB peripheralsare not working• Check that your monitor is turned On.• Reconnect the upstream cable to your computer.• Reconnect the USB peripherals (downstream connector).• Switch Off and then turn On the monitor again.• Reboot the computer.• Some USB devices like external portable HDD require higherelectric current; connect the device directly to thecomputer system.High SpeedUSB 2.0interface isslowHigh Speed USB2.0 peripheralsworking slowly ornot working at all• Check that your computer is USB 2.0-capable.• Some computers have both USB 2.0 and USB 1.1 ports.Ensure that the correct USB port is used.• Reconnect the upstream cable to your computer.• Reconnect the USB peripherals (downstream connector).• Reboot the computer.